@article{10_21136_AM_1973_103476,
     author = {Morita, Katuhiko and Sato, Osamu},
     title = {A method of constructing general contact tangential charts},
     journal = {Applications of Mathematics},
     pages = {238--248},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1973},
     doi = {10.21136/AM.1973.103476},
     mrnumber = {0317568},
     zbl = {0269.65067},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1973.103476/}
}