@article{10_4064_aa166_2_2,
     author = {Liqun Hu},
     title = {An asymptotic formula related to the divisors of
 the quaternary quadratic form},
     journal = {Acta Arithmetica},
     pages = {129--140},
     publisher = {mathdoc},
     volume = {166},
     number = {2},
     year = {2014},
     doi = {10.4064/aa166-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa166-2-2/}
}