@article{DM_2020_32_1_a5,
     author = {A. A. Makhnev and M. S. Nirova},
     title = {On distance-regular graphs with $c_2=2$},
     journal = {Diskretnaya Matematika},
     pages = {74--80},
     publisher = {mathdoc},
     volume = {32},
     number = {1},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2020_32_1_a5/}
}