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References
- ↑ Ralph Blumenhagen; Erik Plauschinn (31 July 2009). Introduction to Conformal Field Theory: With Applications to String Theory. Springer Science & Business Media. p. 80. ISBN 978-3-642-00449-0.
- ↑ Radu Laza; Matthias Schütt; Noriko Yui (27 August 2015). Calabi-Yau Varieties: Arithmetic, Geometry and Physics: Lecture Notes on Concentrated Graduate Courses. Springer. p. 239. ISBN 978-1-4939-2830-9.
