This work would have been impossible without the help of several friends and colleagues. I would like to thank George Miley and Ken Chambers for introducing me in the world of distant galaxies. Ken has been a great mentor and was always available to discuss data-problems and more fundamental questions. The computer problems were solved by Eric Deul and Walter Jaffe and bad or broken tapes were repaired by Klaas Weerstra. Jan Melisse introduced me in the PC world and Marco Spaans assisted me with some Fortran code. Thanks to Huub Röttgering for giving me the hint to go to the VLA Summer School 1991. It was a great experience. Figure 2 was kindly send to me by Walter Bogers and Peter Barthel. Last but not least I would like to thank Lorant Sjouwerman, Erwin van Breemen and Richard Sebus for discussing both my own and their work. It made my stay at the Sterrewacht a pleasant one.
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