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http://peeterjoot.com/2018/10/16/phy2403h-quantum-field-theory-lecture-10-lorentz-boosts-generator-of-spacetime-translation-lorentz-invariant-field-representation-taught-by-prof-erich-poppitz/
PHY2403H Quantum Field Theory. Lecture 10: Lorentz boosts, generator of spacetime translation, Lorentz invariant field representation. Taught by Prof. Erich Poppitz