Teorema de Chen (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Teorema de Chen" in Catalan language version.

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Ross, P.M. «On Chen's theorem that each large even number has the form (p₁+p₂) or (p₁+p₂p₃)». J. London Math. Soc. (2), 10,4, 4, 1975, pàg. 500–506. DOI: 10.1112/jlms/s2-10.4.500.
Cai, Y.C. «Chen's Theorem with Small Primes». Acta Mathematica Sinica, 18, 3, 2002, pàg. 597–604. DOI: 10.1007/s101140200168.