@article{JIS_2011__14_7_a6,
     author = {Jin, Qiao-Xiao and Tang, Min},
     title = {The {4-Nicol} numbers having five different prime divisors},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {14},
     number = {7},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2011__14_7_a6/}
}