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STÜCKELBERG 1938
Stückelberg, E.C.G.;
Die Wechselwirkunskräfte in der Elektrodynamik und in der Feldtheorie der Kernkräfte (Teil II und III) / Interaction in Electrodynamics and in the Field Theory of Nuclear Forces (Part II and III)
Helv. Phys. Acta 11 (1938) 299;
Quotation
"Apart from ... the conservation law of electricity there exists evidently a further conservation law: No transmutations of heavy particles (neutron and proton) into light particles (electron and neutrino) have yet been observed in any transformation of matter. We shall therefore demand a conservation law of heavy charge.'' (Quotation is taken from A. Pais, Inward Bound of the Matter and Forces in the Particle World, Clarendon Press · Oxford. Oxford University Press · New York,
1988).
Related references
More (earlier) information appears in
H. Weyl, Z. Phys. 56 (1929) 330;
More (later) information appears in
E. P. Wigner, Proc. Am. Phil. Soc. 93, 521 (1949);
