Analytic solutions for qq systems obtained from a cut-off type approximation to the funnel potential are applied to bb and cc systems. Perturbative corrections to oscillator energy levels due to inclusion of short range a/r effect are also obtained.
Sandhu, M. K. (1995). Optimal designs for mixture models [master's thesis, The University of Hong Kong]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0029-1812201200010566
Siettos, C. I., Decker, Y. D., & Georgiou, G. C. (2013). Complex Systems Modelling, Analysis, and Control. Journal of Applied Mathematics, 2013(), 56-57-407. https://doi.org/10.1155/2013/508176
Friedler, F. (2006). Effective Modeling for Process Synthesis. Journal of the Chinese Institute of Chemical Engineers, 37(5), 481-490. https://doi.org/10.6967/JCICE.200609.0481