@article{MZ_1930__31_168165,
     author = {I. J. Schwatt},
     title = {Expressions for the {Euler} numbers obtained by expanding sec x  by means of {Maclaurins} {Theorem}},
     journal = {Mathematische Zeitschrift},
     pages = {151--158},
     publisher = {mathdoc},
     volume = {31},
     year = {1930},
     zbl = {55.0135.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1930__31_168165/}
}