TY - JOUR A1 - Hofstadter, D. R. T1 - Metamagical Themas. Virus-like sentences and self-replicating structures T2 - Scientific American, Vol. 248 (No. 1, 1983), pp. 14-19. Y1 - 1983 UR - https://opus4.kobv.de/opus4-Fromm/frontdoor/index/index/docId/29960 N1 - Ex libris Marco Bacciagaluppi ER -