Indagationes mathematicae / Koninklijke Nederlandsche Akademie van Wetenschappen.

Also issued online.

Articles in vol. 1-4, 7- are reprinted from the Proceedings of the Academy's Afdeeling voor de Wis- en Natuurkundige; those in vol. 5-6 are reprinted from the section's Verslag (vol. 5 no. 4-5 and vol. 6 consist only of English and French summaries of articles in the Verslag).

Vol. 13 (1951)-v. 51 (1989) issued also as: Proceedings. Series A, Mathematical sciences, and its later title: Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. Series A, Mathematical sciences, which it absorbed in 1990.