New four-phase generation circuits for low-voltage charge pumps. - Hongchin Lin; Nai-Hsien Chen (ISCAS (1), 2001)

Design of Modified Four-Phase CMOS Charge Pumps for Low-Voltage Flash Memories. - Hongchin Lin; Nai-Hsien Chen; Jainhao Lu (J. Circuits Syst. Comput., 2002)