@article{SM_2017_208_4_a1,
     author = {D. P. Ilyutko and I. M. Nikonov},
     title = {Extremal networks in $\lambda$-geometry, where $\lambda=3,4,6$},
     journal = {Sbornik. Mathematics},
     pages = {479--509},
     publisher = {mathdoc},
     volume = {208},
     number = {4},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_4_a1/}
}