Perdhana, F., A. Utariani, B. P. Semedi, and P. Setiawan. “BACTERIAL COLONY GROWTH IN THE VENTILATOR CIRCUIT OF THE INTENSIVE OBSERVATION UNIT AT RSUD Dr. SOETOMO SURABAYA”. Indonesian Journal of Tropical and Infectious Disease, vol. 6, no. 3, Mar. 2017, pp. 68-73, doi:10.20473/ijtid.v6i3.3013.