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An English (2024) translation by P. Marquet of 3 German papers about "Die Quantenhypothese f\"ur Molekeln mit mehreren Freiheitsgraden (The quantum hypothesis for molecules with multiple degrees of freedom)" and "Bemerkung \"uber die Entropiekonstante zweiatomiger Gase (Remarks on the entropy constant of diatomic gases)" by Max Planck (1915,a,b,c)
Marquet et al. (Mon,) studied this question.