@article{RCM_1986__20_3-4_181770,
     author = {Anders Kock},
     title = {Synthetic {Reasoning} {In} {Differential} {Geometry.}},
     journal = {Revista colombiana de matematicas},
     pages = {129--146},
     publisher = {mathdoc},
     volume = {20},
     number = {3-4},
     year = {1986},
     zbl = {0652.51020},
     url = {http://geodesic.mathdoc.fr/item/RCM_1986__20_3-4_181770/}
}