1. A survey of pollination and seed setting of red clover in Europe;ÅKerberg;Bee World,1966
2. Behaviour of honeybees in red clover fields throughout the flowering period;Benedek;Z. ang. Ent.,1976
3. Effect of temperature on the behaviour and pollinating efficiency of honeybees on winter rape flowers;Benedek;Z. ang. Ent.,1972
4. Pollination of alfalfa and red clover;Bohart;Ann. Rev. Entomol.,1957
5. Pollination and seed-setting in diploid and tetraploid red clover (Trifolium pratense L.) under Danish conditions II. Studies of floret morphology in relation to the working speed of honey and bumble-bees (Hymenoptera: Apoidea);Dennis;Arsskr. Den kgl. Veterinaer- og Landbohojsk.,1967