Appell Functions and the Scalar One-Loop Three-point Integrals in   Feynman Diagrams
  The scalar three-point function appearing in one-loop Feynman diagrams is compactly expressed in terms of a generalized hypergeometric function of two variables. Use is made of the connection between such Appell function and dilogarithms coming from a previous investigation. Special cases are obtained for particular values of internal masses and external momenta. 
Luis G. Cabral-Rosetti and Miguel A. Sanchis-Lozano