@article{10_4064_aa132_4_5,
     author = {Heng Huat Chan and Shaun Cooper and Wen-Chin Liaw},
     title = {An odd square as a sum of an odd number of odd squares},
     journal = {Acta Arithmetica},
     pages = {359--371},
     publisher = {mathdoc},
     volume = {132},
     number = {4},
     year = {2008},
     doi = {10.4064/aa132-4-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa132-4-5/}
}