@article{NSJOM_2010_40_1a_7,
     author = {Irena \v{C}omi\'c},
     title = {Zermello's conditions and
 energies of higher order in generalized {Lagrange-Hamilton} spaces},
     journal = {Novi Sad Journal of Mathematics},
     pages = {57-76},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2010_40_1a_7/}
}