Alberto Bertoni Paola Campadelli Giuliano Grossi A Neural Algorithm for the Maximum Clique Problem: Analysis, Experiments, and Circuit Implementation. 71-88 2002 33 Algorithmica 1 http://link.springer.de/link/service/journals/00453/bibs/2033001/20330071.html db/journals/algorithmica/algorithmica33.html#BertoniCG02