@article{10_4064_aa155_2_8,
     author = {Mariusz Ska{\l}ba},
     title = {Linear recurrences as sums of squares},
     journal = {Acta Arithmetica},
     pages = {207--216},
     publisher = {mathdoc},
     volume = {155},
     number = {2},
     year = {2012},
     doi = {10.4064/aa155-2-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa155-2-8/}
}