@article{ELMA_1978__33_141214,
     author = {Walter Tietze},
     title = {Das {Problem} der {Dreiercliquen.-} {Ein} {Beitrag} zur {Graphentheorie.}},
     journal = {Elemente der Mathematik},
     pages = {81--90},
     publisher = {mathdoc},
     volume = {33},
     year = {1978},
     zbl = {0423.05023},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1978__33_141214/}
}