@article{MM2_1979__27_154602,
     author = {Rainer Picard},
     title = {Zur {Theorie} der harmonischen {Differentialformen.}},
     journal = {Manuscripta mathematica},
     pages = {31--46},
     publisher = {mathdoc},
     volume = {27},
     year = {1979},
     zbl = {0406.58002},
     url = {http://geodesic.mathdoc.fr/item/MM2_1979__27_154602/}
}