[1] Boiteux M. The three-dimensional hydrogen atom as a restricted four-dimensional harmonic oscillator [J]. Physica,1973, 65:381
[2] Cornish F H J. Kepler orbits and the harmonic oscillator [J]. J. Phys., 1984, A17:2191
[3] Kibler M, Negadi T. On the connection between the hydrogen atom and the harmonic oscillator: the continuum case [J]. J. Phys., 1983, A16:4265
[4] Cornish F H J. The hydrogen atom and the four-dimensional harmonic oscillator [J]. J. Phys., 1984, A17:323
[5] Kibler M, Negadi T. Connection between the hydrogen atom and the harmonic oscillator: the zero-energy case [J].Phys. Rev., 1984, A29:2891
[6] Koctelecky V A, Nieto M M, Truax D R. Supersymmetry and the relationship between the Coulomb and oscillator problems in arbitrary dimensions [J]. Phys. Rev., 1985, D32:2627
[7] Barut A O, Duru I H. Introduction of internal coordinates into the infinite-component Majorana equation [J].Proc., R., Soc., London Ser., 1973, A333:217