@article{10_4064_fm_57_2_181_185,
     author = { Iqbalunnisa},
     title = {On some problems of {G.} {Gratzer} and {E.} {T.} {Schmidt}},
     journal = {Fundamenta Mathematicae},
     pages = {181--185},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {1965},
     doi = {10.4064/fm-57-2-181-185},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-57-2-181-185/}
}