A Class of Orthohomological Triangles
  In this article we determine the class of triangles $A_iB_iC_i$ which are orthohomological with a given triangle $ABC$ and inscribed in the triangle $ABC$ (with $A_i \in BC$, $B_i \in CA$ and $C_i \in AB$). 
Claudiu Coanda, Florentin Smarandache, Ion Patrascu
math.GM