A note on spherical f-tilings by right triangles
          Avelino, Catarina P.; Santos, Altino F.   
          
          Acta Mathematica Universitatis Comenianae, LXXXI(2) (2012), 265-281  
          http://www.emis.ams.org/journals/AMUC/_vol-81/_no_2/_santos/santos.pdf  
           
          In this paper we present some spherical f-tilings by two (distinct) right triangles. We classify the group of symmetries of the presented tilings and the transitivity classes of isohedrality are also determined. The combinatorial structure is given in Table 1.  
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