@article{10_4153_S0008439519000407,
     author = {Cushman, Richard and \'Sniatycki, J\k{e}drzej},
     title = {On {Subcartesian} {Spaces} {Leibniz{\textquoteright}} {Rule} {Implies} the {Chain} {Rule}},
     journal = {Canadian mathematical bulletin},
     pages = {348--357},
     year = {2020},
     volume = {63},
     number = {2},
     doi = {10.4153/S0008439519000407},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000407/}
}