@article{MZ_1990__204_3_183758,
     author = {W. Evans and D. Harris and R. Kauffmann},
     title = {Boundary {Behaviour} of {Dirchlet} {Eigenfunctions} of {Second} {Order} {Elliptic} {Operators.}},
     journal = {Mathematische Zeitschrift},
     pages = {85--116},
     publisher = {mathdoc},
     volume = {204},
     number = {3},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MZ_1990__204_3_183758/}
}