@article{10_4064_aa109_3_6,
     author = {Christian Elsholtz},
     title = {On cluster primes},
     journal = {Acta Arithmetica},
     pages = {281--284},
     year = {2003},
     volume = {109},
     number = {3},
     doi = {10.4064/aa109-3-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa109-3-6/}
}