【篇号】:5 【作者】Jörg Brüder and Étienne Fouvry 【文章标题】Lagrange's Four Squares Theorem with almost prime variables. 【期刊名,年份,卷(期),起止页码】Journal für die reine und angewandte Mathematik Volume 1994, Issue 454, Pages 59–96, ISSN (Online) 1435-5345 【全文链接】http://www.reference-global.com/doi/abs/10.1515/crll.1994.454.59