@article{10_4153_CJM_1992_075_0,
     author = {Marshall, Murray},
     title = {The {Pierce-Birkhoff} {Conjecture} for {Curves}},
     journal = {Canadian journal of mathematics},
     pages = {1262--1271},
     year = {1992},
     volume = {44},
     number = {6},
     doi = {10.4153/CJM-1992-075-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-075-0/}
}