Bartomeus, I., J.S. Ascher, D. Wagner, B.N. Danforth, S.R. Colla, S. Kornbluth, & R. Winfree (2011). Climate-associated phenological advances in bee pollinators and bee-pollinated plants. Proc. Natl. Acad. Sci., USA 108(51): 20645-20649 [pdf]
Bartomeus, I., J.S. Ascher, D. Wagner, B.N. Danforth, S.R. Colla, S. Kornbluth, & R. Winfree (2011). Climate-associated phenological advances in bee pollinators and bee-pollinated plants. Proc. Natl. Acad. Sci., USA 108(51): 20645-20649 [pdf]