Hadamard operations on rational functions Alfred J. Van der Poorten (1982/1983) Groupe de travail d'analyse ultramétrique
How many numbers satisfy the 3 x + 1 conjecture? Krasikov, I. (1989) International Journal of Mathematics and Mathematical Sciences
How the shift parameter affects the behavior of a family of meta-Fibonacci sequences. Cai, Mu, Tanny, Stephen M. (2008) Journal of Integer Sequences [electronic only]
Hyper-sums of powers of integers and the Akiyama-Tanigawa matrix. Inaba, Yoshinari (2005) Journal of Integer Sequences [electronic only]