L. J. Boucher, Kart Koeber ; editors, Helga Demmer ...[et al.]. L. J. Boucher ...[et al.]; editors, Helga Demmer ...[et al.]. Karl Koeber ... [et al] ; editors, Helga Demmer ...[et al.]. Helga Demmer ...[et al.] ; editor, Helga Demmer ...[et al.]. Jean-Claude Maire ... [et al]; editor, Helga Demmer ... [et al]. L. J. Boucher ... [et al] ; editors, Karl-Christian Buschbeck ...[et al.].