[1] BUHLER J.-CRANDALL R.-ERNVALL R.-METSÄNKYLÄ T.-SHOKROLLAHI M. A.: Irregular primes and cyclotomic invariants to 12 million. J. Symbolic Comput. 31 (2001), 89-96. MR 1806208 | Zbl 1001.11061

[2] WOOLRIDGE K.: Chap. III: Numerical data on irregular primes. In: Some Results in Arithmetical Functions Similar to Euler's Phi-Function. Ph.D. Thesis, Univ. of Illinois, 1975, pp. 32-41.

[3] ANDĚL J. : Matematická statistika. SNTL, Praha, 1978. (Czech) Zbl 0457.62001