**Stela
Dimitrova Zhelezova**

Institute of Mathematics and
Informatics, Bulgarian Academy of Sciences

**Research
Interests**:

construction
and study of combinatorial resolvable designs, orthogonal resolutions, spreads
and parallelisms of projective spaces, cryptographic properties of boolean
functions and S-boxes

**Address:**

Institute of Mathematics and Informatics

P.O.Box 323

5000 V.Tarnovo

Bulgaria

e-mail : stela@math.bas.bg

(v,c x u,lambda)-splitting BIBDs

Cyclic parallelisms of PG(5,2)

2-parallelisms of PG(5,2) with automorphisms of
order 31

Transitive 2-parallelisms of PG(5,2)

Parallelisms of PG(3,4) with cyclic
automorphism group of order 4

Parallelisms of PG(3,4) with automorphisms of order 3

Parallelisms of PG(3,4) with automorphisms of order 5