1. T. Agoh, K. Dilcher, L. Skula, Wilson quotients for composite moduli. Math. Comp. 67, 843–861 (1998)
2. J.H. Conway, R.K. Guy, The Book of Numbers (Springer, New York, 1996)
3. J.B. Cosgrave, K. Dilcher, Extensions of the Gauss-Wilson theorem. Integers 8, article A39 (2008)
4. E. Costa, R. Gerbicz, D. Harvey, A search for Wilson primes (2012, preprint); available at
http://arxiv.org/abs/1209.3436
5. R. Crandall, K. Dilcher, C. Pomerance, A search for Wieferich and Wilson primes. Math. Comp. 66, 433–449 (1997)