TY  - RPRT
TI  - Integrated head developments.
AU  - E P Valstyn
PY  - 1972
DO  - 10.1111/j.1749-6632.1972.tb13124.x
UR  - https://pubmed.ncbi.nlm.nih.gov/4500474/
ID  - 4500474
ER  -