TY  - RPRT
TI  - The water immersion objective.
AU  - G H NEEDHAM
PY  - 1961
DO  - 10.1111/j.1365-2818.1961.tb05234.x
UR  - https://pubmed.ncbi.nlm.nih.gov/13728107/
ID  - 13728107
ER  -