“Vacuum Tube-Based Train Waste Collection and Segregation Technique” (2024) iJournals:International Journal of Software & Hardware Research in Engineering ISSN:2347-4890, 12(1). पर उपलब्ध: https://ijournals.in/journal/index.php/ijshre/article/view/224 (अंतिम उपयोग: 22 अक्टूबर 2026).