by Christiansen, E.H., Mølgaard, H., Christensen, P.D., Sørensen, K.E., Christensen, C.K., Mogensen, C.E.
Published in European heart journal (01.11.1998)

by Christensen, P.D
Published in Fertilizer progress (1976)

by Christensen, P.D
Published in Proceedings (1974)

by Christensen P.D, Nielson R.F
Published in Proceedings Annual Northwest Fertilizer Conference (1977)

by James, D.W, Christensen, P.D
Published in Proceedings (1974)

by James, D.W, Christensen, P.D
Published in Utah science (1975)

by Christensen P.D, Nielson R.F, Lamborn R.E
Published in Proceedings Annual Northwest Fertilizer Conference (1978)

by Christensen, P.D, Nielson, R.F, Lamborn, R.E
Published in Proc Annu Northwest Fert Conf (1978)

by Fornshell, J.A, Frydenlund, D.D, Christensen, P.D
Published in Journal of plankton research (1984)

by Richardson E.A, Christensen P.D, Dewey W.G, Nielson R.F, Ashcroft G.L, Hanks R.J
Published in Utah Science (1977)

by Christensen, P.D, Lamborn, R.E, Nielson, R.F
Published in Utah science (1979)