IEC TC/SC 49. IEC 61240 Ed. 1.0 b:1994, Piezoelectric devices - Preparation of outline drawings of surface-mounted devices (SMD) for frequency control and selection - General rules. Washington, DC: American National Standards Institute (ANSI), 2007.

IEC TC/SC 49. IEC 61240 Ed. 1.0 b:1994, Piezoelectric devices - Preparation of outline drawings of surface-mounted devices (SMD) for frequency control and selection - General rules. Washington, DC: American National Standards Institute (ANSI), 2007.