@article{GDZPPN002221713, title = {Zur Theorie der harmonischen Differentialformen.}, journal = {Manuscripta mathematica}, volume = {29}, year = {1979}, pages = {31-46}, zbl = {0406.58002}, url = {http://dml.mathdoc.fr/item/GDZPPN002221713} }
Picard, Rainer. Zur Theorie der harmonischen Differentialformen.. Manuscripta mathematica, Tome 29 (1979) pp. 31-46. http://gdmltest.u-ga.fr/item/GDZPPN002221713/