Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Takashi Iwashita,Effects of the Biquadratic Exchange Interaction in Ferromagnet and Antiferromagnet with S=1--Pair Model Approximation,長崎県立女子短期大学研究紀要,02878046,長崎 : 長崎県立女子短期大学,1976-12,,24,p9-16,https://cir.nii.ac.jp/crid/1520853832097060736,