https://www.jstage.jst.go.jp/article/jpsj/64/7/64_7_2609/_article
Low Temperature Thermal and Magnetic Properties of Cu-Doped Haldane Gap Antiferromagnet NENP
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https://www.jstage.jst.go.jp/article/jpsj1946/61/5/61_5_1772/_article
Heat Capacities of Haldane-Gap Antiferromagnet NENP in Magnetic Field
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heat capacitieshaldanegapmagneticfield