Roest, S. Flowering and vegetative propagation of pyrethrum(Chrysanthemum cinerariaefolium vis.) in vivo and in vitro (Book) - Wageningen Centre for Agricultural Publishing and Documentation 1976 - 105 p. 24 cm. ISBN: 9022006220 Universal Decimal Class. No.: 582.998:581.145.1:631.532 ROE / 12928