@article{10_4064_aa165_1_4,
     author = {Ping Xu},
     title = {The evaluation of two-dimensional lattice sums via
 {Ramanujan's} theta functions},
     journal = {Acta Arithmetica},
     pages = {57--89},
     publisher = {mathdoc},
     volume = {165},
     number = {1},
     year = {2014},
     doi = {10.4064/aa165-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa165-1-4/}
}