Carmona, F., G. Barona, E. de Alvarez, and M. Astudillo. “Bacteriological Studies in the Diphtheria Epidemic in Buenaventura, Valle, Colombia in 1992”. Colombia Medica, vol. 24, no. 4, Dec. 1993, pp. 142-6, doi:10.25100/cm.v24i4.6498.