%0 Journal Article %A John Burgess %A Richard Lockhart %T Classical hierarchies form a modern standpoint. Part III. BP-sets %J Fundamenta Mathematicae %D 1983 %P 107-118 %V 115 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-115-2-107-118/ %R 10.4064/fm-115-2-107-118 %G en %F 10_4064_fm_115_2_107_118