Avila, F. et al. 1986. Evidence of pili k88 and k99 as protecting antigens : immunization against enteric swine colibacillosis by sow vaccination. Revue d’élevage et de médecine vétérinaire des pays tropicaux. 39, 3-4 (mars 1986), 293–296. DOI:https://doi.org/10.19182/remvt.8554.