- Bethune, D.S. (2)
- Beyers, R. (2)
- Salem, J.R. (2)
- Boonman, M. (1)
- Burbank, P. (1)
- Dorn, H.C. (1)
- Glass, T. (1)
- Goddard III, W.A. (1)
- Haynes, J. (1)
- Johnson, R.D. (1)
- Kiang, C.-H. (1)
- Meijer, G. (1)
- Stevenson, S. (1)
- de Vires, M.S. (1)
- van Bentum, P.J.M. (1)
- van Loosdrecht, P.H.M. (1)