https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/04/Superconductivity_4-physics.pdf
https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/04/lecture2.pdf
https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/04/lecture3.pdf
https://sci.sohag-univ.edu.eg/main/wp-content/uploads/2013/04/lecture4.pdf
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