@article{MM2_1991__70_1_155596,
     author = {Michael Struwe},
     title = {The evolution of harmonic mappings with free boundaries.},
     journal = {Manuscripta mathematica},
     pages = {373--384},
     publisher = {mathdoc},
     volume = {70},
     number = {1},
     year = {1991},
     zbl = {0724.58022},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155596/}
}