@inproceedings{bridges2012:41,
  author      = {Alessandra Capanna and Mauro Francaviglia and Marcella G. Lorenzi
},
  title       = {Architecture, Form, Expression: The Helicoidal Skyscraper's Geometry
},
  pages       = {349--356},
  booktitle   = {Proceedings of Bridges 2012: Mathematics, Music, Art,
                 Architecture, Culture},
  year        = {2012},
  editor      = {Robert Bosch and Douglas McKenna and Reza Sarhangi},
  isbn        = {978-1-938664-00-7},
  issn        = {1099-6702},
  publisher   = {Tessellations Publishing},
  address	  = {Phoenix, Arizona, USA}
}