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document
Ouwerkerk, M. (author), Andersen, N.H. (author), Veldkamp, F.F. (author), Schoonman, J. (author)
journal article 1986
document
Andersen, N.H. (author), Clausen, K.N. (author), Kjems, J.K. (author), Schoonman, J. (author)
journal article 1986
document
Ouwerkerk, M. (author), Veldkamp, F.F. (author), Andersen, N.H. (author), Schoonman, J. (author)
journal article 1985