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- [2] Bribes, Tips and Gifts: Informal Payments in Healthcare. Similarities and Differences PROCEEDINGS OF THE 20TH INTERNATIONAL CONFERENCE ON CURRENT TRENDS IN PUBLIC SECTOR RESEARCH, 2016, 20 : 328 - 335
- [4] Informal economies and energy efficiency: Empirical evidence from African countries RENEWABLE & SUSTAINABLE ENERGY REVIEWS, 2025, 214
- [5] The implementation of informal sector taxation: Evidence from selected African countries EJOURNAL OF TAX RESEARCH, 2016, 14 (03): : 601 - 623