1
by Blickensdörfer-Ehlers, A., Eschmann, W.G., Neunzert, H., Schelkes, K.
Published 1980
Springer Berlin Heidelberg

2
by Blickensdörfer-Ehlers, A., Eschmann, W.G., Neunzert, H., Schelkes, K.
Published 1982
Springer Berlin Heidelberg