A. Bowo Laksono, E. Sariana, and R. Ramadoni, “THE EFFECT OF BUTEYKO BREATHING EXERCISE ON INCREASING PEAK EXPIRATIONAL FLOW IN THE ELDERLY AT THE TRESNA WERDHA BUDI MULIA III SOCIAL HOME”, JFKI, vol. 3, no. 2, pp. 99-107, Oct. 2023.