Meng J and N Yang (1995). “Analysis on Technology Acquisition and the Efficiency of Economic Scale.” Beijing Hangkong Hangtian Daxue Xuebao/J Beijing University of Aeronautics and Astronautics 21(3): 67-72.
Meng J and N Yang (1995). “Analysis on Technology Acquisition and the Efficiency of Economic Scale.” Beijing Hangkong Hangtian Daxue Xuebao/J Beijing University of Aeronautics and Astronautics 21(3): 67-72.