The Composite Operator Method (COM)
  The Composite Operator Method (COM) is formulated, its internals illustrated in detail and some of its most successful applications reported. COM endorses the emergence, in strongly correlated systems (SCS), of composite operators, optimally deals with their unusual features and implements algebra constraints, and other relevant symmetries, in order to properly compute the unconventional properties of SCS. 
Adolfo Avella and Ferdinando Mancini
cond-mat.str-el cond-mat.supr-con