@article{PDMA_2013_6_a31,
     author = {M. B. Abrosimov and O. V. Modenova},
     title = {About the lower bounds for the number of additional arcs in a minimal vertex 1-extension of oriented path},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {71--72},
     publisher = {mathdoc},
     number = {6},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2013_6_a31/}
}