Kapralov S.N.,
Topalova S., On the Steiner Triple Systems of order 21 with automorphisms of
order 3, Proceedings of the Third International Workshop on Algebraic and
Combinatorial Coding Theory, V.Voda, Bulgaria (1992), 105-108.
Baicheva Ts.,
Bogdanova G., Ilieva S., Topalova S., Object-oriented C++ library for
computations in and over finite fields of characteristic 2, Mathematics and
Education in Mathematics (1994), 227-230.
Topalova S., On the
order of the automorphism group of 2-(40,10,3) designs, Mathematics and
Education in Mathematics (1996), 161-166.
Topalova S.,
Enumeration of 2-(25,5,2) Designs with an automorphism of order 5, J.
Combinatorics, Information and System Sciences, 22, No.3-4 (1997), 161-176.
Landjev I., Topalova S., New Symmetric (61,16,4)
designs invariant under the dihedral group of order 10, Serdika Math.
J., 24 (1998), 179-186.
Kapralov S.N.,
Topalova S., Enumeration of 2-(21,6,3) Designs with Automorphisms of Order 7 or
5, Ars Combinatoria 48 (1998), 135-146.
Topalova S., Enumeration of 2-(21,5,2) designs with
automorphisms of an odd prime order, Discretnyi Analis i Issledovanie
operatsii (In Russian) series 1, vol.5, N1 (1998), 64-81.
Topalova S., Construction and study of combinatorial
designs with certain automorphisms, Ph. D. Thesis,
Topalova S., Designs from tactical configurations, Mathematics
and Education in Mathematics (1998), 135-138.
Topalova S., Hadamard 2-(43,21,10) designs with
automorphisms of order 21 and binary self-dual codes of lengths 86 and 88, Proceedings
of the Second International Workshop on Optimal Codes and Related Topics,
Sozopol, Bulgaria (1998), 193-197.
Topalova S., 2-(51,6,2) designs with automorphisms of
order 51, Proceedings of the Sixth International Workshop on Algebraic and
Combinatorial Coding Theory, Pskov, Russia (1998), 220-223.
Topalova S., Hadamard matrices of order 44 with
automorphisms of order 7, Proceedings of the Seventh International Workshop
on Algebraic and Combinatorial Coding Theory, Bansko, Bulgaria}
(2000), 305-310.
Solov'eva F.,
Topalova S., On the automorphism group of perfect binary codes and Steiner
triple systems, Problems of Information Transmission vol. 36, N4 (2000),
331-335.
Solov'eva F.,
Topalova S., Perfect binary codes and Steiner triple systems with the maximal
order of the automorphism group, Diskretnii analis i issledovanie operatsii
series 1, vol. 7, N4 (2000), 101-110 (in Russian).
Topalova S., Symmetric
2-(69,17,4) Designs with Automorphisms of order 13, J. Statistical
Planning and Inference 95 (2001), 335 - 339.
Topalova S., Zlatarsky R., Construction of STS(21)
with automorphisms of order 2, Proceedings of the Third International
Workshop on Optimal Codes and Related Topics, Sunny Beach, Bulgaria (2001),
147 - 150.
Topalova S., Groups of automorphisms and enumeration
of combinatorial designs, Proceedings of the EWM International Workshop on
Groups and Graphs,
Topalova S., Zlatarsky R., Construction of STS(21) of
Topalova S., Zlatarsky R., On STS(21) of
Topalova S., Classification of Hadamard matrices of
order 44 with Automorphisms of order 7, Discrete Mathematics, vol. 260
(2003), 275-283.
Topalova S., Zlatarski R., Construction of doubles of
the 2-(21,5,1) design with automorphisms of order 2, Proceedings of the
Ninth International Workshop on Algebraic and Combinatorial Coding Theory,
Kranevo, Bulgaria (2004), 379-383.
Topalova S., STS(21) with Automorphisms of order 3
with 3 fixed points and 7 fixed blocks, Mathematica Balkanica, Vol. 18
(2004), pp. 215-220.
V. Fack,
V. Fack,
S. Topalova, S. Zhelezova, On the classification of
doubly resolvable designs, Proceedings of the Fourth International Workshop
on Optimal Codes and Related Topics, Pamporovo, June 2005,
S. Topalova, S. Zhelezova, On the structure of doubly
resolvable 2-(21,3,1) designs, Proceedings of the Tenth International
Workshop on Algebraic and Combinatorial Coding Theory, Zvenigorod, Russia
(2006), 263-268.
Z. Mateva, S. Topalova, Hadamard 2-(63,31,15) Designs
Invariant under the Dihedral Group of Order 10, International Conference
Pioneers of Bulgarian Mathematics, Book of Abstracts, Sofia, July 8-10,
2006, p.77
Z. Mateva,
V. Fack, S. Topalova, J. Winne, R. Zlatarski, Enumeration
of the doubles of the projective plane of order 4, Discrete
Mathematics 306 (2006) 2141-2151.
Z.
Mateva,
S. Topalova,
Z. Mateva, S. Topalova, Doubles of Hadamard 2-(19,9,4)
Designs with Automorphisms of Order 3, Proceedings of the Fifth
International Workshop on Optimal Codes and Related Topics, Balchik, June
2007, Bulgaria, 183-189.
Kaski P., Östergård P., Topalova S., Zlatarski
R., Steiner Triple Systems of Order 19 and 21 with
Subsystems of Order 7, Discrete Mathematics, 308 (2008), 2732-2741,
doi:10.1016/j.disc.2006.06.038.
S.
Topalova, S. Zhelezova, Classification
of the 2-spreads of PG(5,2), Mathematics and Education in Mathematics (2008).
S.
Topalova, S. Zhelezova, Sets of mutually orthogonal resolutions of
BIBDs, Proceedings of the Eleventh International Workshop on Algebraic
and Combinatorial Coding Theory,
S.Topalova,
S.Zhelezova, Classification
of doubly resolvable designs and orthogonal resolutions, Enhancing
Cryptographic Primitives with Techniques from Error Correcting codes,
B.Preneel, S.Dodunekov, V. Rijmen, S. Nikova eds., in NATO Science for
Peace and Security Series - D: Information and Communication Security, Volume
23, IOS Press, Amsterdam (2009), 260 --
264.
Z.
Mateva, S. Topalova, Line
spreads of PG(5,2), J. Comb. Designs, Volume 17, Issue 1 (2009),
90-102.
Z. Mateva, S.
Topalova, Hadamard
2-(63,31,15) designs invariant under the dihedral group of order 10, Discrete
Mathematics, Volume 309, Issue 6 (2009),
1347-1356.
S. Topalova, S. Zhelezova, 2-spreads and transitive and
orthogonal 2-parallelisms of PG(5,2),
Graphs and Combinatorics, to appear.
S. Topalova, S. Zhelezova, Doubly resolvable designs
with small parameters, Ars Combinatoria, to appear, preprint.