@article{JRAM_1978__301_152021,
     author = {Samuel S. Wagstaff},
     title = {The least prime in an arithmetic progression with prime difference.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {114--115},
     publisher = {mathdoc},
     volume = {301},
     year = {1978},
     zbl = {0374.10028},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__301_152021/}
}