@article{JMPA_1952_9_31__341_0,
     author = {Markus, Lawrence},
     title = {On completeness of invariant measures defined by differential equations},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {341--353},
     volume = {Ser. 9, 31},
     year = {1952},
     mrnumber = {51386},
     zbl = {0047.29102},
     language = {en},
     url = {http://archive.numdam.org/item/JMPA_1952_9_31__341_0/}
}