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Buisman, C.J.N. (author), Sorokin, D.Y. (author), Kuenen, J.G. (author), Janssen, J.H. (author), Robertson, L.A. (author)
patent 1997
document
Pronk, J.T. (author), Van Dijken, J.P. (author), Bos, P. (author), Kuenen, J.G. (author)
patent 1992