@article{10_21136_MB_1993_126053,
     author = {Zelinka, Bohdan},
     title = {Graphs in which each pair of vertices has exactly two common neighbours},
     journal = {Mathematica Bohemica},
     pages = {163--165},
     publisher = {mathdoc},
     volume = {118},
     number = {2},
     year = {1993},
     doi = {10.21136/MB.1993.126053},
     mrnumber = {1223481},
     zbl = {0777.05092},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1993.126053/}
}