@article{TMF_1988_75_2_a1,
     author = {V. A. Arkad'ev and A. K. Pogrebkov and M. K. Polivanov},
     title = {Expansions with respect to squares, symplectic and poisson structures associated with the {Sturm--Liouville} {problem.~II}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {170--186},
     publisher = {mathdoc},
     volume = {75},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_2_a1/}
}