doi:10.5170/CERN-1970-008engWeisskopf, Victor FrederickModern physics from an elementary point of viewParticle PhysicsCERN-70-08CERN1970http://cds.cern.ch/record/27497610.5170/CERN-1970-008http://cds.cern.ch/record/274976oai:cds.cern.ch:274976Lectures in the CERN Summer Vacation programme, 1969