@article{JIS_2007__10_2_a4,
     author = {\v{C}erin,  Zvonko},
     title = {Sums of squares and products of {Jacobsthal} numbers},
     journal = {Journal of integer sequences},
     year = {2007},
     volume = {10},
     number = {2},
     zbl = {1116.11010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2007__10_2_a4/}
}