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Ahmad Rofaie, Nina Sakinah and Phoong, Seuk Wai and Abdul Talib Abdul@Mutalib, Muzalwana (2022) Light-Emitting Diode (LED) versus High-Pressure Sodium Vapour (HPSV) efficiency: A data envelopment analysis approach with undesirable output. Energies, 15 (13). ISSN 1996-1073, DOI https://doi.org/10.3390/en15134589.