1. N. Croitoru, J. Ishay, B. Perna, and L. Arcan (1977 ) XVII Int. Congr. of Physiological Sciences. Paris, 18-23 July, 1977.
2. N. Croitoru, J. Ishay, B. Perna, and R. Ikan (1977 ) The XIth Scientific Meet, of the Association for the Advancement of Science in Israel, p.69 . 28-30 March. 1977.
3. D. Guiglia (1972 ) Les Guepes Sociales (Hymenoptera. Vespidae) d'Europe Occidentale et Septentrionale , p.181 . Masson & Cie, Paris.
4. Comb bulding by the oriental hornet (Vespa orientalis)
5. Photoelectric properties of the ‘yellow strips’ of social wasps