@book{15528, author = {Shirkov, D. V. and Logunov, A. A. and}, title = {International JINR-CERN School on High Energy Physics. Lectures submitted to "Black Sea Summer School", Varna, Bulgaria, 13-27 June 1971. Vol. 2 (of 2 vols). Preprint: E2-6157.}, publisher = {Joint Inst. for Nuclear Research}, year = {1972}, address = {Dubna} }