JAGDISH AGNIHOTRI, RAJESH TRIPATHI. Demand and User Willingness for Helicopter Services in Mountainous Regions: The Moderating Role of Cost, Economic Factors, and Accessibility. European Economic Letters (EEL), [S. l.], v. 14, n. 3, p. 845–855, 2024. Disponível em: https://eelet.org.uk/index.php/journal/article/view/1838. Acesso em: 21 oct. 2025.