| 1 |  | Time-frequency nexus between tourism development, economic growth, energy consumption, and ecological footprint in Singapore / Bui Hoang Ngoc, Le Mai Hai . - [Kđ.] : [Knxb.], 2022 Journal of Reviews on Global Economics Vol. 11, 2022, p. 22-32, |
| 2 | | Time-frequency nexus between tourism development, economic growth, human capital, and income inequality in Singapore / Bui Hoang Ngoc, Le Mai Hai . - [Kđ.] : [Knxb.], 2022 Applied Economics Letters 2022, p. 1-6, |