@article{10_4153_S0008439519000055,
     author = {Rosales, Leobardo},
     title = {A {Hopf-type} {Boundary} {Point} {Lemma} for {Pairs} of {Solutions} to {Quasilinear} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {607--621},
     year = {2019},
     volume = {62},
     number = {3},
     doi = {10.4153/S0008439519000055},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000055/}
}