Pohl, Dieter W., Hermann Bach, Martin A. Bopp, Volker Deckert, Pierre Descouts, Rolf Eckert, Hans-Joachim Güntherodt, et al. 1997. “Optical Microscopy in the Nano-World”. CHIMIA 51 (10):760. https://doi.org/10.2533/chimia.1997.760.