@article{10_4064_aa128_4_7,
     author = {Guangshi L\"u},
     title = {Gauss's three squares theorem with almost prime variables},
     journal = {Acta Arithmetica},
     pages = {391--399},
     publisher = {mathdoc},
     volume = {128},
     number = {4},
     year = {2007},
     doi = {10.4064/aa128-4-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa128-4-7/}
}