Essler, J. L., Cafazzo, S., Marshall-Pescini, S., Virányi, Z., Kotrschal, K., & Range, F. (2016). Play Behavior in Wolves: Using the ‘50:50’ Rule to Test for Egalitarian Play Styles. PLoS One.

Essler, Jennifer L., Simona Cafazzo, Sarah Marshall-Pescini, Zsófia Virányi, Kurt Kotrschal, and Friederike Range. "Play Behavior in Wolves: Using the ‘50:50’ Rule to Test for Egalitarian Play Styles." PLoS One 2016.

Essler, Jennifer L., et al. "Play Behavior in Wolves: Using the ‘50:50’ Rule to Test for Egalitarian Play Styles." PLoS One 2016.