@article{MZ_1973__134_171991,
     author = {B. Malcom Brown and W. Desmond Evans},
     title = {On the {Limit-Point} and {Strong} {Limit-Point} {Classification} of 2 n-th {Order} {Differential} {Expressions} with {Widly} {Oscillating} {Coefficients.}},
     journal = {Mathematische Zeitschrift},
     pages = {351--368},
     publisher = {mathdoc},
     volume = {134},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__134_171991/}
}