@article{MS2_1992__70_1_167188,
     author = {B. Gustafsson and Makoto Sakai},
     title = {An {Approximation} {Theorem} for {Integrable} {Harmonic} {Vector} {Fields.}},
     journal = {Mathematica Scandinavica},
     pages = {78--90},
     publisher = {mathdoc},
     volume = {70},
     number = {1},
     year = {1992},
     zbl = {0734.31001},
     url = {http://geodesic.mathdoc.fr/item/MS2_1992__70_1_167188/}
}