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Journal Article
Kiefer, Claus 
ORCID: 0000-0001-6163-9519 and Wichmann, David
(2018).
Semiclassical approximation of the Wheeler–DeWitt equation: arbitrary orders and the question of unitarity.
General Relativity and Gravitation, 50 (6).
Springer.
ISSN 0001-7701