TY - RPRT TI - Microscopic photodensitometry and microspectrophotometry using a fixed double-aperture optical system and an electronically controlled automatic scanning microscope stage. AU - E A Tonna AU - E J Rogers PY - 1968 DO - 10.1111/j.1365-2818.1968.tb00598.x UR - https://pubmed.ncbi.nlm.nih.gov/5656936/ ID - 5656936 ER -