personnel.ssru.ac.thpersonnel.ssru.ac.th/useruploads/files/20180328/7... · 2016, The IIER...
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personnel.ssru.ac.thpersonnel.ssru.ac.th/useruploads/files/20180328/7... · 2016, The IIER International Conference, Zurich, Switzerland No part of this book can be reproduced in