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by Per Kragh Andersen; Henrik Ravn
by Pinstrup-Andersen, Per
by Bundy, Peter; Andersen, Per
by Edited by Torben M. Andersen , Per Molander
by Keiding, Niels; Andersen, Per Kragh
by Pinstrup-Andersen, Per; Cheng, Fuzhi; Frandsen, Soren E. (COL); et al.