@article{MM2_1973__8_154129,
     author = {Klaus Bichteler},
     title = {A {Weak} {Existence} {Theorem} and {Weak} {Permanence} {Properties} for {Strong} {Liftings.}},
     journal = {Manuscripta mathematica},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {8},
     year = {1973},
     zbl = {0245.46062},
     url = {http://geodesic.mathdoc.fr/item/MM2_1973__8_154129/}
}