@article{10_1017_S0017089505002296,
     author = {FORDY, A. P.},
     title = {SYMMETRIES, {LADDER} {OPERATORS} {AND} {QUANTUM} {INTEGRABLE} {SYSTEMS}},
     journal = {Glasgow mathematical journal},
     pages = {65--75},
     year = {2005},
     volume = {47},
     number = {A},
     doi = {10.1017/S0017089505002296},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089505002296/}
}