@article{ZNSL_2004_316_a6,
     author = {G. Mints and A. A. Kojevnikov},
     title = {Intuitionistic frege systems are polynomially equivalent},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {129--146},
     year = {2004},
     volume = {316},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_316_a6/}
}