Volume of a doubly truncated hyperbolic tetrahedron
  The present paper regards the volume function of a doubly truncated hyperbolic tetrahedron. Starting from the previous results of J. Murakami, U. Yano and A. Ushijima, we have developed a unified approach to express the volume in different geometric cases via dilogarithm functions and to treat properly the many analytic strata of the latter. Finally, several numeric examples are given. 
Alexander Kolpakov, Jun Murakami
math.MG math.CV math.DG