1. A. Baker, Logarithmic forms and the abc-conjecture, in: Number theory (Diophantine, computational and algebraic aspects), Proceedings of the international conference, Eger, Hungary, July 29–August 2, 1996 (Györy, Kalman et al., ed.), de Gruyter, Berlin, 1998, 37–44.
2. A. Baker, Experiments on the abc-conjecture, Publ. Math. Debrecen 65/3-4 (2004), 253–260.
3. J. R. Chen, On the Representation of a Large Even Integer as the Sum of a Prime and the Product of at Most Two Primes, Sci. Sinica 16 (1973), 157–176.
4. J. R. Chen, On the Representation of a Large Even Integer as the Sum of a Prime and the Product of at Most Two Primes, II, Sci. Sinica 21 (1978), 421–430.
5. B. de Smit, http://www.math.leidenuniv.nl/\~desmit/abc/ , 2009.