共 45 条
[11]
Framingham M., 2020, WORLDWIDE SPENDING A
[12]
Fu M., 2020, Energy RESEARCH LETTERS, DOI [10.46557/001c.12967, DOI 10.46557/001C.12967]
[13]
QUALITY LADDERS AND PRODUCT CYCLES
[J].
QUARTERLY JOURNAL OF ECONOMICS,
1991, 106 (02)
:557-586
[15]
Haldar A., 2020, ASIAN EC LETT, V1, DOI 10.46557/001c.17804
[16]
Han H., 2020, Asian Economics Letters, V1
[17]
Hassan Tarek Alexander., 2020, Firm-level exposure to epidemic diseases: Covid-19, SARS, and H1N1, DOI [10.3386/w26971, DOI 10.3386/W26971]
[18]
HE P, 2020, EMERG MARK FINANC TR, V56
[19]
Heaven WillDouglas, 2020, OUR WEIRD BEHAV PAND