“…C. Levin, 1960, 1962 of the beta2M type Ritzmann & Levin, 1961, 1962. the assumption is obvious-which we have already discussed in 1955-that they are paraproteins (Schubothe, 1955(Schubothe, , 1958(Schubothe, , 1959(Schubothe, , 1961(Schubothe, , 1962.…”