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The quartic effective action for the heterotic string ☆The quartic effective action of the heterotic string and supersymmetryAn accurate ab initio quartic force field for ammoniaTwo‐quartic tropospheric refractivity profile for correcting satellite dataA Quartic Conformally Covariant Differential Operator for Arbitrary Pseudo-Riemannian Manifolds (Summary)LETTER TO THE EDITOR: Quasi-exactly solvable quartic potentialImportance of quartic anharmonicity for bending partition functions in transition-state theoryThe quartic force field of H2O determined by many‐body methods that include quadruple excitation effectsQuantum theory of anharmonic oscillators. I. Energy levels of oscillators with positive quartic anharmonicityQuantum theory of anharmonic oscillators: Energy levels of a single and a pair of coupled oscillators with quartic coupling ☆