@article{PDMA_2018_11_a4,
     author = {V. M. Fomichev},
     title = {An improved formula for the universal estimation of digraph exponents},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {16--20},
     publisher = {mathdoc},
     number = {11},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2018_11_a4/}
}