@book{42422,
	author = {Franssen, J. M.},
	title = {Phototropism in seedings of sunflower, Helianthus annuus L.},
	publisher = {Veeman & Zonen,},
	year = {1980},
	series = {Mededelingen Landbouwhogeschool},
	address = {Wageningen :}
}