Changes in a population of Apis mellifera L. selected for hygienic behaviour and its relation to brood disease tolerance M. Alejandra Palacio, Emilio E. Figini, Sergio R. Ruffinengo, Edgardo M. Rodriguez, Marcelo L. del Hoyo and Enrique L. Bedascarrasbure Apidologie, 31 4 (2000) 471-478 DOI: 10.1051/apido:2000139