@article{MM2_1976__18_154378,
     author = {Michael Singer},
     title = {One {Parameter} {Subgroups} and {Nonstandard} {Analysis.}},
     journal = {Manuscripta mathematica},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {18},
     year = {1976},
     zbl = {0328.22011},
     url = {http://geodesic.mathdoc.fr/item/MM2_1976__18_154378/}
}