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a quarter century of research history of quantum theory :Old quantum theory old quantum mechanical (\"old\") quantum theory post-1925 new quantum theory Sommerfeld or Bohr–Sommerfeld models old Bohr theory Quantum theory \"old\" quantum theory [old] quantum theory space quantization Bohr-Sommerfeld quantization Bohr-Sommerfeld model of the atom Bohr and Sommerfeld old quantum theory quantum theory Sommerfeld semi-classical quantum generalization Bohr–Sommerfeld theory Bohr–Sommerfeld hypothesis