by Keenan, P.J, Friend, J
Published in NATO ASI series. Series G: Ecological sciences (1989)

by Ellis, Joanna S., Keenan, P.J., Rathmell, W.G., Friend, J.
Published in Phytochemistry (Oxford) (1993)

by Ellis J.S, Keenan P.J, Rathmell W.G, Friend J
Published in Phytochemistry (1993)

by Donnelly, Dervilla M.X., Keenan, P.J., Prendergast, J.P.
Published in Phytochemistry (Oxford) (1973)

by Donnelly, D.M.X, Keenan, P.J, Prendergast, J.P
Published in Phytochemistry (1973)

by Keenan, P.J, Ellis, J.S, Rathmell, W.G, Friend, J
Published in NATO ASI series : Series H : Cell biology (1985)

by Iza, J, Keenan, P.J, Switzenbaum, M.S. (Environmental Engineering Program, Civil Engineering Department, University of Massachusetts, Amherst, MA 01003 (USA))
Published in Water Science and Technology (United Kingdom) (1992)