@article{MM2_1977__23_154522,
     author = {Per-Anders Ivert},
     title = {A {Priori} {Schranken} f\"ur die {Ableitungen} der {L\"osungen} gewisser elliptischer {Differentialgleichungssysteme.}},
     journal = {Manuscripta mathematica},
     pages = {279--294},
     publisher = {mathdoc},
     volume = {23},
     year = {1977},
     zbl = {0374.35021},
     url = {http://geodesic.mathdoc.fr/item/MM2_1977__23_154522/}
}