%0 Journal Article %T Solar-assisted biogas system with air-source heat pump for the energy-saving of indoor heating in north China %A Sun, T M %A Khairuddin, A S M %A Soon, T K %A Pang, L L %A Wang, X R %A Wu, J S %A Zheng, Z J %A Novikovs, A %J IOP Conference Series Earth and Environmental Science %V 1372 %N 1 %P 9 %@ 1755-1307 %D 2024-07-01 %I IOP Publishing %~ DeepDyve