中国科学院数学与系统科学研究院期刊网
AMS
The Exceptional Set in Hua’s Theorem for Three Squares of Primes
Jian Ya LIU, Tao ZHAN
Acta Mathematica Sinica . 2005, (2): 335 -350 .  DOI: 10.1007/s10114-004-0484-2