@article{701282,
     title = {On permutographs},
     booktitle = {Proceedings of the 10th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1982},
     pages = {[275]-286},
     mrnumber = {MR0683789},
     zbl = {0504.03011},
     url = {http://dml.mathdoc.fr/item/701282}
}

Thomas, Gerhard G. On permutographs, dans Proceedings of the 10th Winter School on Abstract Analysis, GDML_Books,  (1982), pp. [275]-286. http://gdmltest.u-ga.fr/item/701282/