@article{04062061,
title = {A geometric characterization of helicoidal surfaces of constant mean curvature.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {43(57)},
year = {1988},
pages = {137-142},
zbl = {0651.53004},
language = {en},
url = {http://dml.mathdoc.fr/item/04062061}
}
Roussos, Ioannis M. A geometric characterization of helicoidal surfaces of constant mean curvature.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 43(57) (1988) pp. 137-142. http://gdmltest.u-ga.fr/item/04062061/