Unification of fundamental interactions  : Proceedings of Nobel Symposium 67 Marstrand, Sweden, June 2-7, 1986 
edited by Lars Brink, Robert Marnelius, Jan S. Nilsson, Per Salomonson and Bo-Sture Skagerstam 
 - London:  World Scientific,  1987. 
 - 209p. 
<br/><br/><label>ISBN: </label>9971509431