@article{ZNSL_1996_232_a7,
     author = {S. R. Dager and S. A. Presa},
     title = {On an analog of the {Runge} theorem for harmonic differential forms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {109--117},
     year = {1996},
     volume = {232},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_232_a7/}
}