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by Hendrix A.T.M
Published in IMAG-Publikaties (Netherlands). no. 147 (1980)

by Maring J
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Published in IMAG-Publikaties (Netherlands). no. 164 (1982)

Published in IMAG-Publikaties (Netherlands). no. 153 (1981)

by Meijer A.B, Rossing W, Smits A.C
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by Abbenhuis C.J.E
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by Hendrix A.T.M
Published in IMAG-Publikaties (Netherlands). no. 147 (1980)

by Oving R.K, Elderen E. van, Vries R.L
Published in IMAG-Publikaties (Netherlands). no. 143 (1980)

by Burg J.J.M. van der, Weel P.A. van
Published in IMAG-Publikaties (Netherlands). no. 149 (1980)

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by Porskamp H.A.J
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by Terpstra J, Kiers G
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