Applegate, David; Pol, Omar E.; Sloane, N. J. A. (2010). "The toothpick sequence and other sequences from cellular automata". Proceedings of the Forty-First Southeastern International Conference on Combinatorics, Graph Theory and Computing. Congressus Numerantium. Vol. 206. pp. 157–191. arXiv:1004.3036. Bibcode:2010arXiv1004.3036A. MR 2762248. /wiki/David_Applegate
Cipra, Barry A. (2010). "What Comes Next?". Science. 327 (5968). AAAS: 943. doi:10.1126/science.327.5968.943. PMID 20167763. /wiki/Barry_A._Cipra
Applegate, David; Pol, Omar E.; Sloane, N. J. A. (2010). "The toothpick sequence and other sequences from cellular automata". Proceedings of the Forty-First Southeastern International Conference on Combinatorics, Graph Theory and Computing. Congressus Numerantium. Vol. 206. pp. 157–191. arXiv:1004.3036. Bibcode:2010arXiv1004.3036A. MR 2762248. /wiki/David_Applegate
Applegate, David; Pol, Omar E.; Sloane, N. J. A. (2010). "The toothpick sequence and other sequences from cellular automata". Proceedings of the Forty-First Southeastern International Conference on Combinatorics, Graph Theory and Computing. Congressus Numerantium. Vol. 206. pp. 157–191. arXiv:1004.3036. Bibcode:2010arXiv1004.3036A. MR 2762248. /wiki/David_Applegate
Sloane, N. J. A. (ed.). "Sequence A139250 (Toothpick sequence)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. /wiki/Neil_Sloane