by Lawrence, S.D, Cooke, J.E.K, Greenwood, J.S, Korhnak, T.E, Davis, J.M
Published in Canadian journal of forest research (01.06.2001)

by Lawrence, S.D, Greenwood, J.S, Korhnak, T.E, Davis, J.M
Published in Planta (01.10.1997)

by Clarke, H.R.G, Lawrence, S.D, Flaskerud, J, Korhnak, T.E, Gordon, M.P, Davis, J.M. (Florida Univ., Gainesville (USA))
Published in Physiologia plantarum (01.06.1998)