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Beams, T.J., Peach, G., and Whittingham, I.B. (2004) Ultracold atomic collisions in tight harmonic traps: perturbation theory, ionization losses and application to metastable helium atoms. Journal of Physics B: Atomic, Molecular and Optical Physics, 37 (22). pp. 4561-4570.

Peach, GIllian, Whittingham, Ian B., and Beams, Timothy J. (2004) Ultracold atomic collisions in tight harmonic traps: quantum-defect model and application to metastable helium atoms. Physical Review A (Atomic, Molecular and Optical Physics), 70 (3). 032713-1.