Shermer, S., Zhou, W., Schirmer, S. G., Zhang, M., & Dai, H. (2011). Bang–bang control design for quantum state transfer based on hyperspherical coordinates and optimal time–energy control. Journal of Physics A: Mathematical and Theoretical, 44(10), . doi:10.1088/1751-8113/44/10/105303

Shermer, Sophie, Weiwei Zhou, S G. Schirmer, Ming Zhang, and Hong-Yi Dai. "Bang–bang Control Design for Quantum State Transfer Based On Hyperspherical Coordinates and Optimal Time–energy Control." Journal of Physics A: Mathematical and Theoretical 44, no. 10 (2011).

Shermer, Sophie, et al. "Bang–bang Control Design for Quantum State Transfer Based On Hyperspherical Coordinates and Optimal Time–energy Control." Journal of Physics A: Mathematical and Theoretical 44.10 (2011).