@article{SLC_1998_41_a2,
     author = {Helmut Kr\"amer},
     title = {Eigenspace {Decompositions} with {Respect} to {Symmetrized} {Incidence} {Mappings}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {41},
     year = {1998},
     url = {http://geodesic.mathdoc.fr/item/SLC_1998_41_a2/}
}