Chien H.-F.Lee S.-H.Wen-Chih L.Tsai Y.-C.2020-06-112020-06-112008https://scholars.lib.ntu.edu.tw/handle/123456789/501762Forecasting monthly sales of cell-phone companies - The use of VAR modelconference paper10.1109/ICICIC.2007.314https://www2.scopus.com/inward/record.uri?eid=2-s2.0-39049121703&doi=10.1109%2fICICIC.2007.314&partnerID=40&md5=80529c5368ec35ab13baad0b26cea85a