id	keyword
ertr-858	tourism
ertr-858	et al
ertr-858	demand
ertr-858	tourism demand
ertr-858	indonesia
ertr-858	model
ertr-858	research
ertr-858	gravity
ertr-858	country
ertr-858	number
ertr-858	effect
ertr-858	tourism research
ertr-858	covid-19
ertr-858	countries