Allton, C., Michael, C., Kenway, R., Pendleton, B., Sachrajda, C. T., Richards, D., . . . Stephenson, P. (1992). The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions. Physics Letters B, 292(3-4), pp. 408-412. doi:10.1016/0370-2693(92)91195-F

Allton, Chris, et al. "The Hyperfine Splitting in Charmonium. Lattice Computations Using the Wilson and Clover Fermion Actions." Physics Letters B 292, no. 3-4 (1992): 408-412.

Allton, Chris, et al. "The Hyperfine Splitting in Charmonium. Lattice Computations Using the Wilson and Clover Fermion Actions." Physics Letters B 292.3-4 (1992): 408-412.