I Looking for resources about tunneling effect on two delta functional barriers

Andre_86
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Hello. I have 2 questions. First, I've read theory of tunneling effect but I need theory of two and more delta functional barriers. How do you think where can I read more about it? I need it for superconductors. And second, where can I find how to add magnetic field to theory of it? How it influence on wave function in zones between potential barriers.
 
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