Helicoidal surfaces with prescribed mean or Gaussian curvature

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HITT, L. and ROUSSOS, I., Computer graphics of helicoidal surfaces with constant mean curvature, An. Acad. bras. Ci.,63 (1991), 211?228.

KENMOTSU, K., Surfaces of revolution with prescribed mean curvature, T�hoku Math. J.32 (1980), 147?153.