Universal sextic effective interaction at criticality
  The renormalization group approach in three dimensions is used to estimate the universal critical value g_6^* of the dimensionless sextic effective coupling constant for the Ising model. The four-loop RG expansion for g_6 is calculated and resummed by means of the Pade-Borel and Pade-Borel-Leroy procedures resulting in g_6^* = 1.596, while the most accurate estimate for g_6^* is argued to be equal to 1.61. 
A. I. Sokolov, E. V. Orlov, V. A. Ul'kov (Saint Petersburg   Electrotechnical University, St.Petersburg, Russia)