1. Painful lumbosacral sensory distribution patterns: embryogenesis to adulthood;Simmons;Orthopaed Rev,1993
2. Developmental horizons in human embryos. Description of age groups XIX, XX, XXI, XXII, and XXIII, being the fifth issue of a survey of the Carnegie collection;Streeter;Contrib Embryol,1951
3. The rate of growth in young human embryos of Streeter's Horizons XIII–XXIII;Iffy;Acta Anat (Basel),1967
4. Two simple nomographs for estimating the age and some of the major external dimensions of the human fetus;Scammon;Anat Rec,1937
5. The first appearance of the human nervous system at stage 8;O'Rahilly;Anat Embryol,1981