DOI CONTENT_TYPE CDU UPDATE_DT 10.20926/ETPIYC.2017.2.1.1 03 C 20170511150135 10.20926/ETPIYC.2017.2.1.2 03 C 20170511150135 10.20926/ETPIYC.2017.2.1.3 03 C 20170511150135 10.20926/ETPIYC.2017.2.1.4 03 C 20170511150135