Shirvanyan, N. V., and V. L. Shirvanyan. “AN IMBEDDING OF FIBONACCI GROUP $F(2,9)$”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 40, no. 1 (209), Mar. 2006, pp. 142-4, doi:10.46991/PYSU:A/2006.40.1.142.