ESTIMATING HERITABILITIES OF WORKER CHARACTERS : A NEW APPROACH USING LAYING WORKERS OF THE CAPE HONEYBEE (APIS MELLIFERA CAPENSIS ESCH.) Robin F.A. MORITZ and Andreas KLEPSCHApidologie, 16 1 (1985) 47-56DOI: https://doi.org/10.1051/apido:19850105