@article{JRAM_1977__291_151865,
     author = {S. Chowla and M.J. Cowles},
     title = {On the diophantine equation 27y2 + 4x3 = {M.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {220--220},
     publisher = {mathdoc},
     volume = {291},
     year = {1977},
     zbl = {0351.10013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1977__291_151865/}
}