Z. Gliwicz
Gliwicz, Z. M., M. Gophen, R. Gulati, D. Hamilton, B. Boss, S. Ostroumov, J. Padisak, B. Wehrli, and Gene E. Likens. 2006. “Memoriam: Professor Robert G. Wetzel. Eco-Ethics International Union”. Ecological Studies, Hazards, Solutions.