@article{PMF_1937_45_1_a2,
     author = {Cram\'er, Harald},
     title = {On the order of magnitude of the difference between consecutive prime numbers},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {51--74},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {1937},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PMF_1937_45_1_a2/}
}