@book{202743,
	author = {O'kane, W. C and Westgate, W. A.  Glover, L. C.},
	title = {Methods of expressing toxicity. Toxicity of nicotine, heptylic acid and caproic acid to mosquíto larvae, Culex pipiens L.  /},
	publisher = { Agricultural Experiment Station},
	address = {Durham, N. H.  :}
}