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Number of items: 2.
Bouhmadi-López, Mariam, Kiefer, Claus 
ORCID: 0000-0001-6163-9519 and Martín-Moruno, Prado ORCID: 0000-0001-8073-4896
(2019).
Phantom singularities and their quantum fate: general relativity and beyond—a CANTATA COST action topic.
General Relativity and Gravitation, 51 (10).
Springer.
ISSN 0001-7701
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