@article{MET_1974__21_175620,
     author = {J. Gordesch},
     title = {Graphes et {Questionnaires} -  {PICARD,} {C.F.}},
     journal = {Metrika},
     pages = {51--51},
     publisher = {mathdoc},
     volume = {21},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/MET_1974__21_175620/}
}