@conference {39153,
	title = {Availability of selenium in forage to ruminants},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {23},
	year = {1963},
	month = {Jan},
	pages = {13-19},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Butler GW and Peterson PJ}
}
@conference {39130,
	title = {The use of isotopes in animal and plant research},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {21},
	year = {1961},
	month = {Jan},
	pages = {130-143},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Butler GW}
}
@conference {39102,
	title = {The chemical composition of rapidly growing ryegrass and its relation to animal production},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {19},
	year = {1959},
	month = {Jan},
	pages = {99-110},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Butler GW}
}
