by Roelofs, J.G.M., Schuurkes, J.A.A.R., Smits, A.J.M.
Published in Aquatic botany (1984)

by Schuurkes, J.A.A.R., Kok, C.J., Den Hartog, C.
Published in Aquatic botany (01.05.1986)

by Roelofs, J.G.M, Schuurkes, J.A.A.R, Smits, A.J.M
Published in Aquatic botany (1984)

by Schuurkes, J.A.A.R, Heck, I.C.C, Hesen, P.L.G.M, Leuven, R.S.E.W, Roelofs, J.G.M
Published in Water, air, and soil pollution (1986)

by Schuurkes, J.A.A.R., Elbers, M.A., Gudden, J.J.F., Roelofs, J.G.M.
Published in Aquatic botany (1987)