Proceedings of the colloquium held in Jena on March 20, 1999, on the occasion of the 300th anniversary of his death (= Acta Historica Astronomiae, vol.
Proceedings of the colloquium held in Jena on ngày 20 tháng 3 năm 1999, on the occasion of the 300th anniversary of his death", Acta Historica Astronomiae, vol.