http://repository.uhamka.ac.id/id/eprint/11750/
Performance Improvement of a Forced Draught Cooling Tower Using a Vortex Generator
Dan, Mugisidi
http://repository.uhamka.ac.id/id/eprint/11750/1/Performance%20Improvement%20of%20a%20Forced%20Colling%20TowerDraught%20Using%20a%20Vortex%20Generator_Gabung.pdf