@article{JRAM_1982__330_152404,
     author = {Alex Rosenberg and E. Becker and J. Harman},
     title = {Signatures of fields and extension theory.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {53--75},
     publisher = {mathdoc},
     volume = {330},
     year = {1982},
     zbl = {0466.12007},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1982__330_152404/}
}