ŢÎŢU, Aurel Mihail, 4 Lucian Blaga University of Sibiu, Victoriei Street, No. 10, Sibiu, Romania 5 The Academy of Romanian Scientists, Splaiul Independenţei, No. 54, District 5, Bucharest, Romania 6 The Romanian Association for Alternative Technology Sibiu, Victoriei Street, No. 10 Sibiu, Romania, Romania