Metode penghematan Gas H2 pada Sistem PEMFC (Proton Exchange Membrane Fuel Cell) dengan mengatur bukaan valve sebanding perubahan daya beban = hidrogen saving method in PEMFC Proton Exchange Membrane Fuel Cell) system by regulating the valve opening proportional change in the power load - Habibullah, author (Fakultas Teknik Universitas Indonesia, 2011)