@article{EJDE_1994__1994_3_a0,
     author = {Lewis,  John L.},
     title = {On critical points of \(p\) harmonic functions in the plane},
     journal = {Electronic journal of differential equations},
     year = {1994},
     volume = {1994},
     number = {3},
     zbl = {0808.31008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1994__1994_3_a0/}
}