TY  - RPRT
TI  - Spectrograph design, 1918-68.
AU  - R C Learner
PY  - 1968
DO  - 10.1088/0022-3735/1/6/201
UR  - https://pubmed.ncbi.nlm.nih.gov/4872361/
ID  - 4872361
ER  -