by Sparrow P.E, Russell R.D
Published in Journal of the Science of Food and Agriculture (1977)

by Sparrow, P.E
Published in The Journal of agricultural science (01.04.1979)

by Sparrow, P.E, Russell, R.D
Published in Journal of the science of food and agriculture (01.08.1977)

by Sparrow, P.E. (Rothamsted Exp. Sta., Harpenden, Herts. AL5 2JQ (UK))
Published in Journal of Agricultural Science (UK) (1979)

by Phillips, F.T. (Rothamsted Exp. Sta., Harpenden, Herts AL5 2JQ (UK)), Etheridge, P, Kavadia, V.S, Sethi, G.R, Sparrow, P.E
Published in Annals of Applied Biology (UK) (1978)