@book{81530,
	author = { H.J.M.Nilwik (and) H.Ten Bohmer.},
	title = {An improvement clowed system for continuous measurement of photosynthesis, respiration and transpiration andtransperation},
	publisher = {H.Veenman and Zonen B.V.},
	year = {1981},
	address = {Wageningen}
}