1
by Hemker, H. C.
Published 1983
Springer Netherlands

2
by Hemker, H. C.
Published 1969
Springer Netherlands

3
by Haas, J. H.
Published 1970
Springer Netherlands
Other Authors: '; ...Hemker, H. C....

4
by Snellen, H. A.
Published 1971
Springer Netherlands
Other Authors: '; ...Hemker, H. C....