@article{oai:soar-ir.repo.nii.ac.jp:00019821,
 author = {Odake, Satoru},
 issue = {11},
 journal = {JOURNAL OF MATHEMATICAL PHYSICS},
 month = {Nov},
 note = {We consider the exactly solvable quantum mechanical systems whose eigenfunctions are described by the multi-indexed orthogonal polynomials of Laguerre, Jacobi, Wilson, and Askey-Wilson types. Corresponding to the recurrence relations with constant coefficients for the M-indexed orthogonal polynomials, it is expected that the systems satisfy the generalized closure relations. In fact we can verify this statement for small M examples. The generalized closure relation gives the exact Heisenberg operator solution of a certain operator, from which the creation and annihilation operators of the system are obtained. Published by AIP Publishing., Article, JOURNAL OF MATHEMATICAL PHYSICS. 57(11):113503 (2016)},
 title = {Recurrence relations of the multi-indexed orthogonal polynomials. IV. Closure relations and creation/annihilation operators},
 volume = {57},
 year = {2016}
}