@article{CTGDC_1968__10_4_395_0,
     author = {Shih, Weishu},
     title = {Characteristic classes as natural transformations and topological index of classical elliptic operators},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {395--447},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {10},
     number = {4},
     year = {1968},
     mrnumber = {248864},
     zbl = {0176.52702},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1968__10_4_395_0/}
}