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N.J. Beijerink, J.J.C.W.M. Buijtels, A.C. Okkens, H.S. Kooistra and S.J. Die
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W.M. Lee, H.S. Kooistra, J.A. Mol, S.J. Dieleman and A.C. Schaefers-Okkens
Pág. 484 - 490
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S.F.M. Bhatti, L. Duchateau, A.C. Okkens, L.M.L. Van Ham, J.A. Mol and H.S. Kooistra
Pág. 797 - 803
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J. de Gier, H.S. Kooistra, S.C. Djajadiningrat-Laanen, S.J. Dieleman and A.C. Okkens
Pág. 1346 - 1359
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