@article{05551209, title = {Tiling proofs of some formulas for the Pell numbers of odd index.}, journal = {Integers}, volume = {9}, year = {2009}, pages = {53-64}, doi = {10.1515/INTEG.2009.006}, zbl = {1207.11023}, language = {en}, url = {http://dml.mathdoc.fr/item/05551209} }
Shattuck, Mark. Tiling proofs of some formulas for the Pell numbers of odd index.. Integers, Tome 9 (2009) pp. 53-64. doi : 10.1515/INTEG.2009.006. http://gdmltest.u-ga.fr/item/05551209/