@article{ZNSL_1977_68_a5,
     author = {S. Yu. Maslov and S. A. Norgela},
     title = {Herbrand strategies and the ``greater deducibility'' relation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {51--61},
     publisher = {mathdoc},
     volume = {68},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1977_68_a5/}
}