@article{MABA_1991_5_3_a7,
     author = {Ch. G. Massouros},
     title = {Constructions of {Hyperfields}},
     journal = {Mathematica balkanica},
     pages = {250},
     year = {1991},
     volume = {5},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/MABA_1991_5_3_a7/}
}