1998 General
Authors: Pronk, J.P.
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1998 Cameroon
Authors: Ros-Tonen, M.A.F., van Andel, T., Assies, W., van Dijk, J.F.W., Duivenvoorden, J.F., van der Hammen, M.C., de Jong, W., Reinders
Authors: Bongers, F.J.J.M.
1998 Colombia
Authors: Martínez, L.
Authors: Samper, C.
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