Heydari, M., Xiaohu, Z., Lai, K. K., Yuxi, Z. and Chen, L. (2019) “INVESTIGATING THE IMPACT OF CRISIS ON CORPORATE COSTS AND SALES USING ECONOMETRICS METHOD”, Proceedings of National Aviation University, 81(4), pp. 71–85. doi: 10.18372/2306-1472.81.14604.