W. Koelle

Reduced sulphur compounds in sandy aquifers and their interactions with groundwater

J. Boettcher, O. Strebel, W. Koelle, 1990 .

The Prediction of the Achievement of Deaf Adolescents from Self-Concept and Locus of Control Measures

J. Convey, W. Koelle, 1982, American annals of the deaf.