@article {40920,
	title = {Exotic birch - leafmining sawflies (Hymenoptera : Tenthredinidae) in Alberta : distributions, seasonal activities and the potential for competition},
	volume = {129},
	year = {1997},
	pages = {319-33},
	publisher = {The Canadian Entomologist},
	author = {Digweed, S. C. and Spence, John R.}
}
