KS C IEC 60368-2-1:2018 Piezoelectric filters of assessed quality — Part 2: Guide to the use of piezoelectric filters — section one: Quartz crystal filters
2023KS C IEC 60368-2-1-2023 Quality Assessment of Piezoelectric Filters Part 2: Piezoelectric Filter User Guide Section 1 Quartz Crystal Filters
2018KS C IEC 60368-2-1:2018 Piezoelectric filters of assessed quality — Part 2: Guide to the use of piezoelectric filters — section one: Quartz crystal filters