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- Radinka Dontcheva, A. J. van Zanten, Stefan M. Dodunekov
- IEEE Transactions on Information Theory
- 2004

In this paper, we present some results concerning a decomposition of binary self-dual codes having an automorphism of an order which is the product of two odd prime numbers. These results are applied to construct self-dual [72,36,12] codes with an automorphism of order 15. Furthermore, it is proved that the automorphism group of a putative binary extremal… (More)

- Radinka Dontcheva
- IEEE Trans. Information Theory
- 2002

- Radinka Dontcheva, Masaaki Harada
- Applicable Algebra in Engineering, Communication…
- 2003

In this note, some new extremal singly-even self-dual codes of lengths 60 and 64 are constructed using automorphisms of order 7. These codes have weight enumerators for which no extremal self-dual codes were previously known to exist.

- Radinka Dontcheva, Masaaki Harada
- IEEE Trans. Information Theory
- 2002

In this correspondence, new extremal self-dual codes of length 62 are constructed with weight enumerators of three different types. Two of these types were not represented by any known code up till now. All these codes possess an automorphism of order 15. Some of them are used to construct extremal self-dual codes of length 60 by the method of subtracting.… (More)

- Z Kalvatchev, E Alexandrov, R Dontcheva, A Madjurova
- Acta virologica
- 1993

Rabbit-antihuman IgG, yolk immunoglobulins (IgY) and monoclonal antibodies against Rickettsia conorii were adsorbed to colloidal gold. Thus obtained conjugates were found to be active and responded specifically to the agent of the Mediterranean Spotted fever. The suitability of the immunogold assay as a alternative to other known immunoenzymatic or… (More)

- Z N Kalvatchev, R V Dontcheva, E G Alexandrov
- Acta virologica
- 1993

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