Ifeanyichukwu Ebubechukwu Onyegiri และ Sunday Ayoola Oke. (2017) A grey relational analytical approach to safety performance assessment in an aviation industry in the developing country. <i>Engineering and Applied Science Research</i>, <i>44</i>(1), 1-15.Ifeanyichukwu Ebubechukwu Onyegiri และ Sunday Ayoola Oke. "A grey relational analytical approach to safety performance assessment in an aviation industry in the developing country". Engineering and Applied Science Research 44 (2017):1-15.Ifeanyichukwu Ebubechukwu Onyegiri และ Sunday Ayoola Oke. A grey relational analytical approach to safety performance assessment in an aviation industry in the developing country. Faculty of Engineering, Khon Kaen University:ม.ป.ท. 2017.