@article{ELMA_1990__45_6_141479,
     author = {Karel A. Post},
     title = {Moessnerian theorems. {How} to prove them by simple graph theoretical inspection.},
     journal = {Elemente der Mathematik},
     pages = {46--51},
     publisher = {mathdoc},
     volume = {45},
     number = {6},
     year = {1990},
     zbl = {0714.11014},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1990__45_6_141479/}
}