1973/02/01 by Roger Penrose, R. Penrose, M. A. H. MacCallum +1 · 13 citations
Mathematics · Physics and Astronomy · #Algebraic and Geometric Analysis #Noncommutative and Quantum Gravity Theories #Quantum Mechanics and Applications
paper · doi:10.1016/0370-1573(73)90008-2
crossref issued 1973/02/01 · crossref published 1973/02/01 · crossref published-print 1973/02/01 · openalex publication_date 1973/02/01 · crossref created 2002/10/17 · crossref deposited 2019/04/06 · openalex created_date 2025/10/10 · crossref indexed 2026/07/21 · openalex updated_date 2026/07/21