@article{ZNSL_2000_272_a12,
     author = {N. V. Kosmatov},
     title = {Upper bounds on homological dimensions of pullback {rings.~II}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {234--237},
     year = {2000},
     volume = {272},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2000_272_a12/}
}