Olarn Wiengweera และ Prasert Suwanvitaya. (2008) Strengthening for pre-tension bridge girder by link slab. Kasetsart University,:ม.ป.ท.Olarn Wiengweera และ Prasert Suwanvitaya. 2008. Strengthening for pre-tension bridge girder by link slab. ม.ป.ท.:Kasetsart University,;Olarn Wiengweera และ Prasert Suwanvitaya. Strengthening for pre-tension bridge girder by link slab. ม.ป.ท.:Kasetsart University, 2008. Print.