1. Hašek, M.: Parabiosis of birds in embryonic development (Parabiosa ptákù v embryonálním vývoji).Čs. Biol. 2:25–26, 1953
2. Hašek, M., Hort, J., Hála, K., and Karaoz, I.: Erythrocyte chimaerism and, possible somatic cell hybridization, InT. Klein, M. Vojtíšková, andV. Zelený (eds.:Genetic variations in somatic cells; pp. 71–77, Academia, Prague, 1966
3. Hašek, M. and Hraba, T.: The significance of phylogenetic kinship in immunological approximation during embryogenesisFolia Biol. 1:1–9, 1955
4. Hort, J. and Hála, K.: Erythrocyte chimaerism in chickens.Polymorph. Biochem. animaux; Xthe Eur. Conf. Animal Blood Group and Bioch. Polymorph, pp. 497–499, Inst. Natl. Rech. Ägronom., Paris, 1966
5. Irwin, M.R.: Some aspects of immunogenetics in relation to taxonomic problems,In C.A. Leone (ed.):Taxonomic Biochemistry and Serology; pp. 487–500, The Ronald Press Company, New York, 1964