@article{JRAM_1969__238_183506,
     author = {Manohar L. Madan},
     title = {Class number relations in fields of algebraic functions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {89--92},
     publisher = {mathdoc},
     volume = {238},
     year = {1969},
     zbl = {0179.07801},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1969__238_183506/}
}