@article{10_4153_CMB_1972_012_3,
     author = {Bondy, J. A.},
     title = {Variations on the {Hamiltonian} {Theme}},
     journal = {Canadian mathematical bulletin},
     pages = {57--62},
     year = {1972},
     volume = {15},
     number = {1},
     doi = {10.4153/CMB-1972-012-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-012-3/}
}