Anharmonic oscillators in higher dimension: Accurate energy eigenvalues and matrix elementsDOI: info:10.1007/BF02847014v. 32107–115
Bhargava, V. T. A., Mathews, P. M., and Seetharaman, M. 1989. "Anharmonic oscillators in higher dimension: Accurate energy eigenvalues and matrix elements." Pramana, 32 107–115. https://doi.org/10.1007/BF02847014.