@Article{LanguascoZaccagnini2008a, Author = "A. Languasco and A. Zaccagnini", Title = "Some estimates for the average of the error term of the {Mertens} product for arithmetic progression", Journal = "Functiones et Approximatio", Volume = 38, Pages = "41--47", Year = 2008, Abstract = "We give estimates for the error term of the Mertens product over primes in arithmetic progressions of the Bombieri--Vinogradov and Barban--Davenport--Halberstam type." }