@Article{LanguascoZaccagnini2009,
  Author    = "A. Languasco and A. Zaccagnini",
  Title     = "On the constant in the {Mertens} product for arithmetic
               progressions. {II}. {Numerical} values",
  Journal   = "Math. Comp.",
  Volume    =  78,
  Pages     = "315--326",
  Url       = "{http://it.arxiv.org/abs/0712.1665}",
  Year      = 2009,
  Abstract  = "This paper reports on the explicit numerical computation
               with at least 100 decimal digits of the constants
               appearing in the Mertens product over primes in arithmetic
               progressions, for progressions with moduli up to 100."
}