@article{10_4153_CJM_1987_061_8,
     author = {Natsume, Toshikazu},
     title = {THE {C} {1-Invariance} of the {Godbillon-Vey} {Map} in {Analytical} {K-Theory}},
     journal = {Canadian journal of mathematics},
     pages = {1210--1222},
     year = {1987},
     volume = {39},
     number = {5},
     doi = {10.4153/CJM-1987-061-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1987-061-8/}
}