Klein C, Cheutin T, O'Donohue MF, Rothblum L, Kaplan H, Beorchia A, Lucas L, Héliot L, Ploton D. The three-dimensional study of chromosomes and upstream binding factor-immunolabeled nucleolar organizer regions demonstrates their nonrandom spatial arrangement during mitosis. Mol Biol Cell. 1998 Nov; 9(11):3147-59.