@article{JIS_2007__10_5_a2,
     author = {Witu{\l}a, Roman and S{\l}ota, Damian},
     title = {New {Ramanujan-type} formulas and {quasi-Fibonacci} numbers of order 7},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {10},
     number = {5},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2007__10_5_a2/}
}