@article{MM2_1981__36_154822,
     author = {Seppo Granlund},
     title = {A {Phragm\'en} - {Lindel\"of} {Principle} for {Subsolutions} of {Quasi} - {Linear} {Equations.}},
     journal = {Manuscripta mathematica},
     pages = {355--365},
     publisher = {mathdoc},
     volume = {36},
     year = {1981},
     zbl = {0506.35033},
     url = {http://geodesic.mathdoc.fr/item/MM2_1981__36_154822/}
}