Kothari, M LLopa A, M1976-04-012009-06-021976-04-012009-06-021976-04-01Kothari ML, Lopa A M. The nature of immunity. Journal of Postgraduate Medicine. 1976 Apr; 22(2): 50-8http://imsear.searo.who.int/handle/123456789/115313engAntigen-Antibody ReactionsHumansImmunityImmunity, CellularImmunity, InnateJournal Article