@article {8034,
	title = {The genus Lepidium in Canada},
	journal = {Madro{\~n}o},
	volume = {16},
	year = {1961},
	month = {1961///},
	pages = {77 - 89},
	author = {G.A. Mulligan}
}
@article {7421,
	title = {The biology of Canadian weeds, 3. Cardaria draba, C. chalepensis and C. pubescens},
	journal = {Canad. J. Pl. Sci.},
	volume = {54},
	year = {1974},
	month = {1974///},
	pages = {149 - 160},
	url = {http://pubs.aic.ca/doi/pdf/ 10.4141/cjps74-024]},
	author = {G.A. Mulligan and J.N. Findlay}
}
@article {7413,
	title = {Taxonomy of the genus Cardaria with particular reference to the species into North America},
	journal = {Canad. J. Bot},
	volume = {40},
	year = {1962},
	month = {1962///},
	pages = {1411 - 1425},
	author = {G.A. Mulligan and C. Frankton}
}
