TY  - RPRT
TI  - [Image differentiation procedures in electron microscopy].
AU  - W Hoppe
AU  - R Langer
AU  - J Frank
AU  - A Feltynowski
PY  - 1969
DO  - 10.1007/bf00633921
UR  - https://pubmed.ncbi.nlm.nih.gov/5360874/
ID  - 5360874
ER  -