@article{MS2_1973__33_166318,
     author = {Matts Ess\'en and John L. Lewis},
     title = {The {Generalized} {Ahlfors-Heins} {Theorem} in {Certain} {d-Dimensional} {Cones.}},
     journal = {Mathematica Scandinavica},
     pages = {113--129},
     publisher = {mathdoc},
     volume = {33},
     year = {1973},
     zbl = {0273.31004},
     url = {http://geodesic.mathdoc.fr/item/MS2_1973__33_166318/}
}