%0 Journal Article %A Baxter, J. R. %A Chacon, R. V. %T Enlargement of σ-Algebras and Compactness of Time Changes %J Canadian journal of mathematics %D 1977 %P 1055-1065 %V 29 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-102-0/ %R 10.4153/CJM-1977-102-0 %F 10_4153_CJM_1977_102_0