ŽÁČEK, P., B. KALINOVÁ, J. ŠOBOTNÍK, O. HOVORKA,
V. PTÁČEK, A. COOPPÉE, F. VERHEGGEN and I. VALTEROVÁ. Comparison of Age-dependent Quantitative Changes in the Male Labial Gland Secretion of Bombus Terrestris and Bombus Lucorum.
Journal of Chemical Ecology. Netherlands: Springer Netherlands, 2009, vol. 35, No 6, p. 698-705, 7 pp. ISSN 0098-0331.