Physics_EG.md

 Electron Photon Interactions and Cascades
 
 [OrangeBible.pdf](uploads/f39dbfc647ad25c6b3c6eac61ebcac0e/OrangeBible.pdf)
+[Tsai PAIR PRODUCTION AND BREMSSTRAHLUNG OF CHARGED LEPTONS.pdf](https://inspirehep.net/files/be2ffc45ed59b1b28208cc386c1e16b3)
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