The comparative pathogenicity of strains of eight serovars and untypable strains of Mannheimia haemolytica in experimental pneumonia of sheepMoses O. Odugbo, Lillian E. Odama, Jarlath U. Umoh and Lami H. LombinVet. Res., 35 6 (2004) 661-669DOI: https://doi.org/10.1051/vetres:2004044