@article{JRAM_1968__230_150849,
     author = {S. Chowla and P. Chowla},
     title = {Formulae for the units and class-numbers of real quadratic fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {61--65},
     publisher = {mathdoc},
     volume = {230},
     year = {1968},
     zbl = {0155.38101},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1968__230_150849/}
}