@article {503,
	title = {A Field-Study of Fertilization and Embryonic Development in the Common Frog (Rana-Temporaria) with Particular Reference to Acidity and Temperature},
	volume = {28},
	year = {1991},
	pages = {346-357},
	author = {Beattie, R.C. and Aston, R.J. and Milner, A.G.P.}
}
