@article{JRAM_1968__233_150891,
     author = {Heinrich Lang},
     title = {\"Uber eine {Gattung} elementar-arithmetischer {Klasseninvarianten} reell-quadratischer {Zahlk\"orper.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {123},
     publisher = {mathdoc},
     volume = {233},
     year = {1968},
     zbl = {0165.36504},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/JRAM_1968__233_150891/}
}