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ON POSSIBILITY OF FIRST-ORDER PHASE TRANSITIONS IN ISING SYSTEMS OF TRIPLET IONS WITH ZERO-FIELD SPLITTING
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PHASE TRANSITIONS IN ISING SYSTEMS OF DOUBLY DEGENERATE 4-LEVEL IONS
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MAGNETIC ORDERING PROPERTIES OF RARE-EARTH IONS IN STRONG CUBIC CRYSTAL FIELDS
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COLLECTIVE EXCITATIONS AND MAGNETIC ORDERING IN MATERIALS WITH SINGLET CRYSTAL-FIELD GROUND STATE
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