Book chapter (1996) - AJ Steinfort (author) , PMLO Scholte (author) , RL Johnson (author) , ARHF Ettema (author) , F Tuinstra (author) , M Nielsen (author) , E Landemark (author) , DM Smilgies (author) , R Feidenhans'l (author) , G Falkenberg (author) , L Seehofer (author)