[1] Fan H Y, Li C. Invariant eigen-operator of the square of Schrdinger operator for deriving energy-level gap [J]. Phys. Lett. A, 2004, 321: 75-78.
[1] Fan H Y, Li C. Invariant eigen-operator of the square of Schrdinger operator for deriving energy-level gap [J]. Phys. Lett. A, 2004, 321: 75-78.
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