https://phongdaotaosdh.vinhuni.edu.vn/nghien-cuu-sinh/thong-tin-luan-an-tien-si/seo/luan-an-tien-si-cua-ncs-bui-nguyen-tram-ngoc-chuyen-nganh-ly-thuyet-xac-suat-va-thong-ke-toan-hoc-106019