Ratnawati, Ratnawati, V Nguyen, J Morton, R Henry, and P Thomas. 2008. “Exhaled Nitric Oxide in Acute Exacerbation of Pediatric Asthma”. Paediatrica Indonesiana 48 (2), 64-70. https://doi.org/10.14238/pi48.2.2008.64-70.