@article{10_4064_aa98_3_1,
     author = {Jianya Liu and Tao Zhan},
     title = {Distribution of integers that are
sums of three squares of primes},
     journal = {Acta Arithmetica},
     pages = {207--228},
     publisher = {mathdoc},
     volume = {98},
     number = {3},
     year = {2001},
     doi = {10.4064/aa98-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa98-3-1/}
}