Sumalee Sonamthiang และ Kanlaya Naruedomkul. (2012) Student clustering and prerequisite concept requirement mapping using a rough set based granular concept hierarchy. Mahidol University:ม.ป.ท.Sumalee Sonamthiang และ Kanlaya Naruedomkul. 2012. Student clustering and prerequisite concept requirement mapping using a rough set based granular concept hierarchy. ม.ป.ท.:Mahidol University;Sumalee Sonamthiang และ Kanlaya Naruedomkul. Student clustering and prerequisite concept requirement mapping using a rough set based granular concept hierarchy. ม.ป.ท.:Mahidol University, 2012. Print.