TY - JOUR AU - Talari, Mohammad AU - khodadad Hosseini, seyed hamid AU - Kordnaiej, Asadollah AU - Azar, Adel TI - Contingency model of business portfolio analysis in holding companies JO - Strategic Management Researches VL - 25 IS - 74 SP - 127 EP - 155 PY - 2019 DO - ER -