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      Some special types of developable ruled surface 

      Alegre Rueda, Pablo Sebastián; Arslan, Kadri; Carriazo Rubio, Alfonso; Murathan, Cengizhan; Özturk, Günay (Hacettepe University (Faculty of Science), 2010)
      In this study we consider the focal curve Cγ of a space curve γ and its focal curvatures. We characterize some special ...