@article{VMUMM_1997_4_a13,
     author = {V. S. Matveev},
     title = {An example of a geodesic flow on the {Klein} bottle, integrable by a polynomial in the momentum of the fourth degree},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {47--48},
     publisher = {mathdoc},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1997_4_a13/}
}