ŠOBOTNÍK, Jan, Blanka KALINOVÁ, Lucie CAHLÍKOVÁ, František WEYDA,
Vladimír PTÁČEK and Irena VALTEROVÁ. Age-dependent changes in structure and function of the male labial gland in Bombus terrestris.
Journal of Insect Physiology. ELSEVIER, 2008, vol. 2008, No 54, p. 204 - 214. ISSN 0022-1910.