1. Departamentul de Apicultură şi Sericicultură; Universitatea de Ştiinţe Agricole şi Medicină Veterinară; Calea Mănăştur 3-5 400372 Cluj-Napoca Romania
2. Institut für Biologie; Molekulare Ökologie; Martin-Luther-Universität Halle-Wittenberg; Hoher Weg 4 06099 Halle Germany
3. Department of Ecology; Swedish University of Agricultural Sciences; P.O. Box 7044 75007 Uppsala Sweden
4. Department of Zoology and Entomology; University of Pretoria; 0002 Pretoria South Africa