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https://t.co/QTfnEHw5iH "Such an approximation was applied for the first time to calculate systems consisting of electrons and ions (e.g., in crystals). Ions are much heavier and ..."
https://t.co/QTfnEHw5iH "Such an approximation was applied for the first time to calculate systems consisting of electrons and ions (e.g., in crystals). Ions are much heavier and ..."