%0 Journal Article %A C. Ash %A J. Knight %T Relatively recursive expansions %J Fundamenta Mathematicae %D 1991 %P 137-155 %V 140 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-140-2-137-155/ %R 10.4064/fm-140-2-137-155 %G en %F 10_4064_fm_140_2_137_155