International plant protection policy and market development: on the threshold of a new WTO round : proceedings of the conference, Wageningen, The Netherlands, November 4 and 5, 1999 / [eds.: R.A. Ackerman, M.J.P.J. Jenniskens]

International plant protection policy and market development: on the threshold of a new WTO round : proceedings of the conference, Wageningen, The Netherlands, November 4 and 5, 1999 / [eds.: R.A. Ackerman, M.J.P.J. Jenniskens]