1. Air Force Research Laboratory. Columbus Large Image Format 2007 dataset over Ohio State University.https://www.sdms.afrl.af.mil/index.php?collection=clif2007
2. Beech H. &Suhartono M.(2019 April 02).Between two boeing crashes days of silence and mistrust. https://www.nytimes.com/2019/04/02/world/asia/boeing-max-8-lion-air.html