Journal for the History of Astronomy 11 (3/1980), pp. 174-191 Kremer, Richard L.: The Use of Bernhard Walther's Astronomical Observations: Theory and Observation in Early Modern Astronomy.
In: Journal for the History of Astronomy 11 (3/1980) S. 174–191 Richard L. Kremer: The Use of Bernhard Walther’s Astronomical Observations: Theory and Observation in Early Modern Astronomy.