@article{10_4153_CMB_2011_080_8,
     author = {Chang, Der-Chen and Li, Bao Qin},
     title = {Description of {Entire} {Solutions} of {Eiconal} {Type} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {249--259},
     year = {2012},
     volume = {55},
     number = {2},
     doi = {10.4153/CMB-2011-080-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2011-080-8/}
}