https://jpsayle.com/product/ferrons-reise-beschadigt/
Ferrons Reise: Beschädigt – JP Sayle
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https://physics.unist.ac.kr/physics/category/seminars.do?mode=view&articleNo=285575&title=Collective+Excitations+in+Quantum+Materials%3A+From+Ferrons+to+Axial+Phonons
Collective Excitations in Quantum Materials: From Ferrons to Axial Phonons | 물리학과
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