Csűrös, Z., Kálmán, V., Lengyel-Mészáros, Á., Petró, J. “STUDY OF THE CORRELATION BETWEEN STRUCTURE AND REDUCIBILITY OF ACETOPHENONE DERIVATIVES I. THE VALIDITY OF THE HAMMETTEQUATION IN THE MEERWEIN-PONNDROF-VERLEY REDUCTION OF ACETOPHENONE DERIVATIVES”, Periodica Polytechnica Chemical Engineering, 12(2), pp. 161–179, 1968.