@article{CM_1937__4__308_0,
     author = {Kerner, Michael},
     title = {Abstract differential geometry},
     journal = {Compositio Mathematica},
     pages = {308--341},
     year = {1937},
     publisher = {Johnson Reprint Corporation},
     volume = {4},
     zbl = {0017.02203},
     language = {en},
     url = {https://www.numdam.org/item/CM_1937__4__308_0/}
}