@article{TM_1975_135_a14,
     author = {G. Sommer},
     title = {On the dynamical contents of two-particle structure, positivity, crossing symmetry, and analyticity},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {137--148},
     publisher = {mathdoc},
     volume = {135},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_1975_135_a14/}
}