@article{CM_1940__7__141_0,
     author = {Berwald, L.},
     title = {\"Uber {Finslersche} und {Cartansche} {Geometrie} {II.} {Invarianten} bei der {Variation} vielfacher {Integrale} und {Parallelhyperfl\"achen} in {Cartanschen} {R\"aumen}},
     journal = {Compositio Mathematica},
     pages = {141--176},
     publisher = {Johnson Reprint Corporation},
     volume = {7},
     year = {1940},
     zbl = {0021.42801},
     language = {de},
     url = {http://www.numdam.org/item/CM_1940__7__141_0/}
}