@article{SIGMA_2011_7_a70,
     author = {Alexander V. Turbiner},
     title = {From {Quantum~}$A_N$ {(Calogero)} to~$H_4$ {(Rational)} {Model}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2011},
     volume = {7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2011_7_a70/}
}