The behaviour of wasps (Vespula germanica L. and V. vulgaris L.) when foraging Reference:FREE, J. B. The behaviour of wasps (Vespula germanica L. andV. vulgaris L.) when foraging. Insectes Sociaux, 1970, 17.1: 11-19.URL:https://link.springer.com/content/pdf/10.1007/BF02223769.pdf
