@article{Hofstadter, author = {Hofstadter, D. R.}, title = {Metamagical Themas. Virus-like sentences and self-replicating structures}, series = {Scientific American, Vol. 248 (No. 1, 1983), pp. 14-19.}, journal = {Scientific American, Vol. 248 (No. 1, 1983), pp. 14-19.}, language = {en} }