@article{ZNSL_2018_475_a4,
     author = {E. C. Krasko and I. N. Labutin and D. N. Moskvin and A. V. Omelchenko and A. I. Khrabrov},
     title = {On some enumerative problems of lambda calculus},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {99--121},
     publisher = {mathdoc},
     volume = {475},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2018_475_a4/}
}