1. Engel, H.J., Schütz, R. and Zerbst, E. (1974). Die Blutzellen im Vitalpräparat. Publ. Wiss. Film. Sekt. Med., 2, 227
2. Engel, H.J. (1963). Neutrophile Granulozyten — Homo sapiens. Publ. Wiss. Film. Sekt. Med., 2, 245
3. Engel, H.J. (1968). Untersuchungen zur LE-Zellgenese im Supravitalpräparat. Blut, 17, 93
4. Norberg, B. (1969). Neutrophil segmentation and radial segmentation. Scand. J. Haematol., 6, 274
5. Norberg, B. and Uddman, R. (1973). The oxalate-induced radial segmentation of the nuclei of lymphocytes and monocytes from peripheral blood. Blut, 26, 261