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