준 리만 다양체: 두 판 사이의 차이

* {{책서적 인용 | last=Chen|first=Bang-Yen| | title = Pseudo-Riemannian geometry, δ-invariants and applications| publisher=World Scientific Publisher | 날짜=2011|isbn=978-981-4329-63-7|언어고리=en}}

* {{책서적 인용|title=Semi-Riemannian geometry with applications to relativity|volume=103|series=Pure and Applied Mathematics|first=Barrett|last=O’Neill|publisher=Academic Press|날짜=1983|isbn=978-008057057-0|언어고리=en}}