@article{MZ_1933__37_168464,
     author = {A.H. Copeland},
     title = {A matrix theory of measurement.},
     journal = {Mathematische Zeitschrift},
     pages = {542--555},
     publisher = {mathdoc},
     volume = {37},
     year = {1933},
     zbl = {0007.25203},
     url = {http://geodesic.mathdoc.fr/item/MZ_1933__37_168464/}
}