@inbook{Skellam1967,
author = {Skellam, J.G.},
title= {Seasonal periodicity in theoretical population ecology},
year = {1967},
editor = {Lecam, L.},
editor = {Neyman, J.},
booktitle = {Proceedings, Fifth Berkeley Symposium on Mathematical Statistics and Probability, Vol. 	IV "Biology and Problems of Health"},
address = {Berkeley},
publisher = {University of California},
pages = {179--205},
}