%0 Journal Article %A B. V. Rao %T Lattice of Borel structures %J Colloquium Mathematicum %D 1971 %P 213-216 %V 23 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-23-2-213-216/ %R 10.4064/cm-23-2-213-216 %G en %F 10_4064_cm_23_2_213_216