Sundararajan, S., and G. M. Afle. “Reliability and Validity of Low Cost Pressure Gauge Manometer for Measurement of Respiratory Muscle Strength in Healthy Children: A Cross-Sectional Study”. International Journal Of Community Medicine And Public Health, vol. 10, no. 9, Aug. 2023, pp. 3127-31, doi:10.18203/2394-6040.ijcmph20232655.