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                 NIELSEN HH, 1959, HANDBUCH PHYSIK, V37, P217
              
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                  ON FOURTH ORDER HAMILTONIAN OF AN ASYMMETRIC ROTOR MOLECULE OF ORTHORHOMBIC SYMMETRY
                 
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                    JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS SECTION A-PHYSICS AND CHEMISTRY,
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                  :359-+

