@article {11600,
	title = {Observations on populations of adult beaver-beetles, Platypsyllus castoris (Platypsyllidae: Coleoptera)},
	journal = {PApa},
	volume = {39},
	number = {4},
	year = {1963},
	pages = {215-228.},
	author = {Janzen, D. H.}
}
