@article{JMAG_2008_4_2_a3,
     author = {Jan Milewski},
     title = {An invariant form of the {Euler0-Lagrange} operator},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {267--277},
     year = {2008},
     volume = {4},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2008_4_2_a3/}
}