1. ISO 12713:1998(E), Non-destructive testing—Acoustic emission inspection—Primary calibration of transducers, International Organization for Standardization, Geneva, Switzerland
2. ISO 12714:1999, Non-destructive testing—Acoustic emission inspection—Secondary calibration of acoustic emission sensors, International Organization for Standardization, Geneva, Switzerland,
3. ISO/TR 13115:2011, Non-destructive testing—Methods for absolute calibration of acoustic emission transducers by the reciprocity technique, International Organization for Standardization, Geneva, Switzerland
4. K. Ono, Calibration methods of acoustic emission sensors. Materials 9, 508 (2016). https://doi.org/10.3390/ma9070508
5. K. Ono, Critical examination of ultrasonic transducer characteristics and calibration methods. RNDE (2017). https://doi.org/10.1080/09349847.2017.1375585