@article{10_4064_aa127_2_1,
     author = {Zhi-Wei Sun},
     title = {Mixed sums of squares and triangular numbers},
     journal = {Acta Arithmetica},
     pages = {103--113},
     publisher = {mathdoc},
     volume = {127},
     number = {2},
     year = {2007},
     doi = {10.4064/aa127-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa127-2-1/}
}