TY  - RPRT
TI  - Positional information and the spatial pattern of cellular differentiation.
AU  - L Wolpert
PY  - 1969
DO  - 10.1016/s0022-5193(69)80016-0
UR  - https://pubmed.ncbi.nlm.nih.gov/4390734/
ID  - 4390734
ER  -