2011KS C IEC 60122-2-1:2011 Quartz crystal units for frequency control and selection-Part 2:Guide to the use of quartz crystal units for frequency control and selection-Section one:Quartz crystal units for microprocessor clock supply
2003KS C IEC 60122-2:2003 Quartz crystal units for frequency control and selection-Part 2:Guide to the use of quartz crystal units for frequency control and selection