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The present paper reviews the results of ab initio studies on the magnetic hyperfine structure in spectra of spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules. The main goal of the present paper is to show that such theoretical investigations can be used to reliably reproduce, explain and predict the results of the corresponding measurements.

Theoretical investigation of the hyperfine structure in spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules