SANDEEP KUMAR PENCHALA. “ENTERPRISE-GRADE MOBILE PUSH-TO-TALK SYSTEMS FOR EMERGENCY SERVICES: ARCHITECTURAL FRAMEWORKS, SECURITY PARADIGMS, AND PERFORMANCE OPTIMIZATION”. TPM – Testing, Psychometrics, Methodology in Applied Psychology 32, no. S9 (2025): Posted 15 December (December 5, 2025): 2408–2423. Accessed March 4, 2026. https://tpmap.org/submission/index.php/tpm/article/view/3780.