@article{MM2_1969__1_153981,
     author = {J\"urgen Bliedtner},
     title = {On the analytic structure of harmonic groups.},
     journal = {Manuscripta mathematica},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {1},
     year = {1969},
     zbl = {0206.40901},
     url = {http://geodesic.mathdoc.fr/item/MM2_1969__1_153981/}
}