1. ISO 10447: Resistance welding—peel and chisel testing of resistance spot and projection welds
2. Fastritsky, V.S., Vingris, L.T., Ardentov, V.V., Florinsky, J.B., Plotnikov, V.I., Rodnevsky, L.A.: Apparatus for non-destructive testing of spot welds using an electromagnetic field, Rizhsky Politekhnichesky Institut (Riga,SU), US Patent 4503392, Filing date: 21/7/1981
3. Polrolniczak, H.: Ultrasonic testing as a means for quality assurance in resistance spot welding. Krautkramer—Sonderdruck Nr. SD 297 (1999)
4. Roye W.: Ultrasonic testing of spot welds in the automotive industry. Krautkramer - Sonderdruck Nr. SD 298 (1999)
5. Denisov, A.A., Shakarji, C.M., Maev, R.G., Paille, J.M., Lawford, B.B.: Spot weld analysis with two-dimensional ultrasonic arrays. NIST, J. Res. Natl. Inst. Stand. Technol. 109, 233–244 (2004)