An elementary analysis of Coxeter's figure, as Escher might have understood it, is given by Casselman, Bill, How did Escher do it?, AMS Feature Column, 2010-06 [2014-06-17], (原始内容存档于2014-07-14)
Coxeter expanded on the mathematics of triangle group tessellations, including this one in Coxeter, H. S. M., The trigonometry of hyperbolic tessellations, Canadian Mathematical Bulletin, 1997, 40 (2): 158–168, MR 1451269, doi:10.4153/CMB-1997-019-0.
Coxeter expanded on the mathematics of triangle group tessellations, including this one in Coxeter, H. S. M., The trigonometry of hyperbolic tessellations, Canadian Mathematical Bulletin, 1997, 40 (2): 158–168, MR 1451269, doi:10.4153/CMB-1997-019-0.
An elementary analysis of Coxeter's figure, as Escher might have understood it, is given by Casselman, Bill, How did Escher do it?, AMS Feature Column, 2010-06 [2014-06-17], (原始内容存档于2014-07-14)