@article{MM2_1971__5_154074,
     author = {Ulrich Staude},
     title = {Kleine periodische {L\"osungen} bei nichtlinearen stark-elliptischen {Systemen} von partiellen {Differentialgleichungen} {I.}},
     journal = {Manuscripta mathematica},
     pages = {251--274},
     publisher = {mathdoc},
     volume = {5},
     year = {1971},
     zbl = {0218.35038},
     url = {http://geodesic.mathdoc.fr/item/MM2_1971__5_154074/}
}