@article{10_4153_CJM_1976_069_6,
     author = {Sabidussi, Gert},
     title = {Weak {Separation} {Lattices} of {Graphs}},
     journal = {Canadian journal of mathematics},
     pages = {691--724},
     year = {1976},
     volume = {28},
     number = {4},
     doi = {10.4153/CJM-1976-069-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-069-6/}
}