Koiou, L. (2010) Influence of the probiotic Enterococcus faecium DSM 7134 as a feed additive on digestive, microbiological and immunological traits in police, working and sled dogs, Berlin: Mensch & Buch Verlag X, 97 p. с.: tab., ill. 978-3-86664-966-8 : 74.10 лв.