@article{MS2_1953__1_165500,
     author = {Olli LEHTO},
     title = {On an extension of the concept of deficiency in the theory of meromorphic functions},
     journal = {Mathematica Scandinavica},
     pages = {207--212},
     publisher = {mathdoc},
     volume = {1},
     year = {1953},
     zbl = {0053.04601},
     url = {http://geodesic.mathdoc.fr/item/MS2_1953__1_165500/}
}