1. Revisao do genero Haemonchus Cobb, 1898 (Nematoda: Trichostrongylidae);Almeida;Memorias do Instituto Oswaldo Cruz,1935
2. Intraspecific variation in parasitic nematodes;Chitwood;Systematic Zoology,1957
3. Subspeeiation in Haemonchus contortus (Rudolphi, 1803) Nemata, Trichostrongyloidea;Das;The Cornell Veterinarian,1960
4. Contribution to the revision of genus Haemonchus Cobb;Daskalov;Bulletin of the Central Helminthological Laboratory, Bulgarian Academy of Sciences,1957
5. On the morphologic diversity of the female Haemonchus contortus (Rudolphi, 1803) Cobb, 1898 and Haemonchus placei (Place, 1893) Ransom 1911;Daskalov;Bulletin of the Central Helminthological Laboratory, Bulgarian Academy of Sciences,1963