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- M. Petkov
- 1998

While in the univariate case solutions of linear recurrences with constant coeecients have rational generating functions, in the multivariate case the situation is much more interesting: even thoughâ€¦ (More)

- M. Petkov, Bruno Salvy
- 1993

Hypergeometric sequences are such that the quotient of two successive terms is a xed rational function of the index. We give a generalization of M. Petkov sek's algorithm to nd all hypergeometricâ€¦ (More)

- G. Nedzhibov, M. Petkov
- NAA
- 2004

Let Ï• be analytic iterative vector function with fixed point Î± and integer order p > 1. It is proved that for each approximation z 0 of Î± and enough close to Î± the corresponding iterative process zâ€¦ (More)

- G. C. Barker, Carol Bayley, +6 authors Richard Shepherd
- Risk analysis : an official publication of theâ€¦
- 2010

We consider food chain risks and specifically address stakeholder participation in the risk analysis process. We combine social and natural science perspectives to explore the participation processâ€¦ (More)

- M. Petkov
- Veterinarno-meditsinski nauki
- 1980

A specific agglutinative and absorbed K 99 antiserum was produced and also the presence of the antigen K 99 was proved in strains E. coli, isolated from calves. It was proved that out of 272 strainsâ€¦ (More)

- B M Bozhilov, A Rezashka, Parashkeva Gancheva, M. Petkov
- Veterinarno-meditsinski nauki
- 1979

Studies aiming to establish the most suitable method for conjugated serum production and control were carried out. Results obtained indicate that purest globulin fractions are obtained in case theâ€¦ (More)

- M Kapurdova, M. Petkov, N Marchev
- Veterinarno-meditsinski nauki
- 1982

Experiments were carried out to isolate, purify, and concentrate the K 88 antigen of Escherichia coli organisms. Employed were two purification methods --isoelectric precipitation, andâ€¦ (More)

- G Gerganov, K SÅrtmadzhiev, M. Petkov
- Veterinarno-meditsinski nauki
- 1981

Studies was the titer of antihemagglutinins of a total of 3263 serum samples taken from birds routinely vaccinated against Newcastle disease, originating from various poultry farms of the country.â€¦ (More)

- M. Petkov
- 2007

Let t n denote the number of unlabeled trees on n vertices. Let t(x) = P 1 n=1 t n x n be the corresponding generating function. Similarly, let T n , h n , and i n denote the numbers of rooted trees,â€¦ (More)

- Anton Petkov, D Ganovski, Ia Peev, M. Petkov
- Veterinarno-meditsinski nauki
- 1986

Biochemical and serologic studies were carried out with Escherichia coli strains isolated from pigs affected with diarrhea. A total of 161 were investigated, 13 (8.01 per cent) of which were found toâ€¦ (More)