@article{ZNSL_1971_20_a12,
     author = {G. E. Mints},
     title = {Exact estimates for provability of the rule of transfinite induction in initial parts of arithmetic},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {134--144},
     year = {1971},
     volume = {20},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_20_a12/}
}