Nikolova D., T. Valkanova, 2025, Optimal design of
hydrogen infrastructure based on ecological, economic, and social frameworks,
Proceedings of University of Ruse, Vol. 64, book 10.1, PP: 22-27, ISSN
1311-3321 (PRINT), ISSN 2535-1028 (CD-ROM), ISSN 2603-4123 (ON-LINE)
