@article{CM_1977__34_1_99_0,
     author = {Van der Put, M.},
     title = {Some properties of the ring of germs of $C^\infty $-functions},
     journal = {Compositio Mathematica},
     pages = {99--108},
     publisher = {Noordhoff International Publishing},
     volume = {34},
     number = {1},
     year = {1977},
     zbl = {0404.58012},
     language = {en},
     url = {http://www.numdam.org/item/CM_1977__34_1_99_0/}
}