1.
Hasibuan I, Supriatmo M, Faisal A, Panggabean G, Daulay R, Siregar Z, Lubis H. Peak expiratory flow rate of primary school children in high and low air pollution level areas. PI [Internet]. 24Sep.2016 [cited 3Jul.2024];43(1):10-3. Available from: https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/650