@article{oai:soar-ir.repo.nii.ac.jp:00011744,
 author = {Odake,  Satoru and Sasaki,  Ryu},
 issue = {5},
 journal = {PROGRESS OF THEORETICAL PHYSICS},
 month = {Nov},
 note = {In one-dimensional quantum mechanics, or the Sturm-Liouville theory, Crum's theorem. describes the relationship between the original and the associated Hamiltonian systems, which are iso-spectral except for the lowest energy state. Its counterpart in 'discrete' quantum mechanics is formulated algebraically, elucidating the basic structure of the discrete quantum mechanics, whose Schrodinger equation is a difference equation., Article, PROGRESS OF THEORETICAL PHYSICS. 122(5):1067-1079 (2009)},
 pages = {1067--1079},
 title = {Crum's Theorem for 'Discrete' Quantum Mechanics},
 volume = {122},
 year = {2009}
}