- document
- Wichers, Jan E.W. (author) journal article 1991
- document
- de Kat, Jan Otto (author), Wichers, Johan E.W. (author) journal article 1991
- document
- Tan, Seng Gie (author), Wichers, J.E.W. (author) journal article 1990
- document
- Wichers, J.E.W. (author) journal article 1986