@article{10_4064_ap_32_2_145_185,
     author = {Wiktor Szczyrba},
     title = {Lagrangian formalism in the classical field theory},
     journal = {Annales Polonici Mathematici},
     pages = {145--185},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1976},
     doi = {10.4064/ap-32-2-145-185},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-32-2-145-185/}
}