@article{CMH_1977__52_139685,
     author = {Gottfried T. R\"uttimann},
     title = {Jordan-Hahn decomposition of signed weights on {Finite} orthogonality spaces.},
     journal = {Commentarii mathematici Helvetici},
     pages = {129--144},
     year = {1977},
     volume = {52},
     zbl = {0368.06008},
     url = {http://geodesic.mathdoc.fr/item/CMH_1977__52_139685/}
}