@article{TIMM_2018_24_2_a19,
     author = {M. S. Nirova},
     title = {On distance-regular graphs with $\theta_2=-1$},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {215--228},
     year = {2018},
     volume = {24},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2018_24_2_a19/}
}