Piai, M., Appelquist, T., & Shrock, R. (2004). Quark dipole operators in extended technicolor models. Physics Letters B, 595(1-4), pp. 442-452. doi:10.1016/j.physletb.2004.06.066

Piai, Maurizio, Thomas Appelquist, and Robert Shrock. "Quark Dipole Operators in Extended Technicolor Models." Physics Letters B 595, no. 1-4 (2004): 442-452.

Piai, Maurizio, Thomas Appelquist, and Robert Shrock. "Quark Dipole Operators in Extended Technicolor Models." Physics Letters B 595.1-4 (2004): 442-452.