Do Foraging Bumblebees Scent-Mark Food Sources and Does It Matter?Ulrich Schmitt and Andreas Bertsch · Oecologia · 1990

Species specificity and complexity of Dufour's gland secretion of bumble beesJan Tengö; Abraham Hefetz; Andreas Bertsch; Ulrich Schmitt; Gunther Lübke; Wittko Francke · 1991