@article{JIS_2014__17_4_a6,
     author = {Elsner,  Carsten},
     title = {On error sums for square roots of positive integers with applications to {Lucas} and {Pell} numbers},
     journal = {Journal of integer sequences},
     year = {2014},
     volume = {17},
     number = {4},
     zbl = {1291.11099},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2014__17_4_a6/}
}