Physical Review LettersObermayer, Mahler, and Haken replyK. Obermayer, G. Mahler, Hermann HakenPublished Feb 15, 1988• 2 citationsPublisherAbstractReceived 9 December 1987DOI:https://doi.org/10.1103/PhysRevLett.60.658©1988 American Physical SocietyDOI10.1103/physrevlett.60.658