Citation: Nw. Calderone et Rm. Turcotte, DEVELOPMENT OF SAMPLING METHODS FOR ESTIMATING LEVELS OF VARROA-JACOBSONI (ACARI, VARROIDAE) INFESTATION IN COLONIES OF APIS-MELLIFERA (HYMENOPTERA, APIDAE), Journal of economic entomology, 91(4), 1998, pp. 851-863