MathSciNet bibliographic data MR2799371 53C50 (53C40) Chen, Bang-Yen Pseudo-Riemannian geometry, $\delta$$\delta$-invariants and applications. With a foreword by Leopold Verstraelen. World Scientific Publishing Co. Pte. Ltd., Hackensack, NJ, 2011. xxxii+477 pp. ISBN: 978-981-4329-63-7; 981-4329-63-0 Article

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