@article{TIMM_2015_21_3_a24,
     author = {A. A. Makhnev and D. V. Paduchikh},
     title = {On extensions of strongly regular graphs with eigenvalue 4},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {233--255},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2015_21_3_a24/}
}