@article{ZNSL_1974_46_a1,
     author = {B. B. Venkov and H. V. Koch},
     title = {On $p$-tower classfields for an imagunau quadratic field},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--13},
     publisher = {mathdoc},
     volume = {46},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_46_a1/}
}