@article{JRAM_1975__276_151617,
     author = {Helmut Hasse and Leon Bernstein},
     title = {Ein formales {Verfahren} zur {Herstellung} parameter-abh\"angiger {Scharen} quadratischer {Grundeinheiten.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {206--212},
     publisher = {mathdoc},
     volume = {276},
     year = {1975},
     zbl = {0314.12009},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1975__276_151617/}
}