@article{10_4153_CMB_1972_101_7,
     author = {Williams, H. C.},
     title = {The {Primality} of {N=2A3n-1}},
     journal = {Canadian mathematical bulletin},
     pages = {585--589},
     year = {1972},
     volume = {15},
     number = {4},
     doi = {10.4153/CMB-1972-101-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-101-7/}
}