Bessis M, Ross D
C R Acad Hebd Seances Acad Sci D. 1978 Jan;286(1):157-60.
An optical polarizing microscope with a good coefficient of extinction permits the visualization of the cytoplasmic fibrillar body in living preparations and smears of leukemic cells (human leukemias and the L 5222 experimental leukemia). These inclusions are not visible by phase contrast microscopy nor in fixed and stained smears.