Anna Bernasconi Valentina Ciriani Fabrizio Luccio Linda Pagli Synthesis of Autosymmetric Functions in a New Three-Level Form. 450-464 2008 42 Theory Comput. Syst. 4 http://dx.doi.org/10.1007/s00224-007-9009-6 db/journals/mst/mst42.html#BernasconiCLP08