Oscar Castillo Patricia Melin Oscar Montiel Roberto Sepúlveda Witold Pedrycz Janusz Kacprzyk Theoretical Advances and Applications of Fuzzy Logic and Soft Computing, Selection of Papers from IFSA 2007 IFSA (2) Advances in Soft Computing 42 Springer 2007 978-3-540-72433-9 db/conf/ifsa/ifsa2007-2.html