NF A09-340-6:2009 Non-destructive testing - Ultrasonic examination - Part 6 : time-of-flight diffraction technique as a method for detection and sizing of discontinuities.
2014NF A09-337*NF EN ISO 16828:2014 Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique as a method for detection and sizing of discontinuities
2009NF A09-340-6:2009 Non-destructive testing - Ultrasonic examination - Part 6 : time-of-flight diffraction technique as a method for detection and sizing of discontinuities.