@article{JRAM_1979__305_152081,
     author = {Valeriu St. Udrescu},
     title = {On the diophantine equation 27 y2 + 4 x3 = {D.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {134--135},
     publisher = {mathdoc},
     volume = {305},
     year = {1979},
     zbl = {0392.10019},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1979__305_152081/}
}