books.google.com - Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools for the contemporary observer. This development of higher quality and more sensitive equipment makes...http://books.google.com/books/about/Astronomical_Photometry.html?id=ojzepXhy9DIC&utm_source=gb-gplus-shareAstronomical Photometry
