ищу статью
M. I. Haftel and V. B. Mandelzweig,
"Exact solution of coupled equations and the hyperspherical formalism: Calculation of expectation values and wavefunctions of three Coulomb-bound particles" в Annals of Physics, Volume 150, Issue 1, 1 October 1983, Pages 48-91,
- DOI:
http://dx.doi.org/10.1016/0003-4916(83)90004-0
