Helm, B., Visser, M. E., Schwartz, W., Kronfeld-Schor, N., Gerkema, M., Piersma, T., & Bloch, G. (2017). Two sides of a coin: Ecological and chronobiological perspectives of timing in the wild. Philos Trans R Soc Lond B Biol Sci.

Helm, Barbara, Marcel E. Visser, William Schwartz, Noga Kronfeld-Schor, Menno Gerkema, Theunis Piersma, ja Guy Bloch. "Two Sides of a Coin: Ecological and Chronobiological Perspectives of Timing in the Wild." Philos Trans R Soc Lond B Biol Sci 2017.

Helm, Barbara, et al. "Two Sides of a Coin: Ecological and Chronobiological Perspectives of Timing in the Wild." Philos Trans R Soc Lond B Biol Sci 2017.