@article{VMUMM_2007_2_a0,
     author = {I. D. Tveritinov},
     title = {Self-adjointness of quadratic {Hamiltonians} and a representation method for their exponents},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--11},
     publisher = {mathdoc},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2007_2_a0/}
}