@article{CMH_1979__54_139770,
     author = {Martin Schechter},
     title = {The invariance principle.},
     journal = {Commentarii mathematici Helvetici},
     pages = {111--125},
     publisher = {mathdoc},
     volume = {54},
     year = {1979},
     zbl = {0444.47015},
     url = {http://geodesic.mathdoc.fr/item/CMH_1979__54_139770/}
}