@article{MZ_1956__65_169592,
     author = {S.M. Shah and S.K. Singh},
     title = {On the derivative of meromorphic function with maximum defect.},
     journal = {Mathematische Zeitschrift},
     pages = {171--174},
     publisher = {mathdoc},
     volume = {65},
     year = {1956},
     zbl = {0073.06603},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__65_169592/}
}