Vaccination against swine enzootic pneumonia in field conditions: effect on clinical, pathological, zootechnical and economic parametersFrancisco J. Pallarés, Serafín Gómez, Guillermo Ramis, Juan Seva and Antonio MuñozVet. Res., 31 6 (2000) 573-582DOI: https://doi.org/10.1051/vetres:2000141