@article{10_4064_sm_38_1_391_405,
     author = {Robert Butts and Pasquale Porcelli},
     title = {Multiplicity theory},
     journal = {Studia Mathematica},
     pages = {391--405},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1970},
     doi = {10.4064/sm-38-1-391-405},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-38-1-391-405/}
}