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Wong, P.C. and Tang, C.K. (1999) Cyclic Subgroup Separability of Certain HNN Extensions of Finitely Generated Abelian Groups. Rocky Mountain Journal of Mathematics, 29 (1). pp. 347-356. ISSN 0035-7596, DOI https://doi.org/10.1216/rmjm/1181071695.
Zhou, Yajun and Ratnavelu, Kurunathan and Zhong, Zheng and McCarthy, Ian E. (1999) Electron impact on excited helium. Journal of Physics B: Atomic, Molecular and Optical Physics, 31 (23). L959-L965. ISSN 0953-4075, DOI https://doi.org/10.1088/0953-4075/31/23/003.