Application of gravity models with a fixed component in the international trade flows of coal, iron ore and crude oil
2017 ◽
Vol 19
(2)
◽
pp. 334-351
◽
2021 ◽
pp. 227797872198992
2019 ◽
Vol 32
(1)
◽
pp. 3684-3699
Keyword(s):
1993 ◽
Vol 69
(3)
◽
pp. 239-252
◽
Keyword(s):