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Chaddha, G (1980) Spin one biquadratic XY model. In: Journal of Physics and Chemistry of Solids, 41 (8). pp. 923-924.
Chaddha, G (1979) Curie-temprature of a spin one xy ferromagnet with uniaxial anisotropy. In: Solid State Communications, 30 (12). pp. 8111-14.
Chaddha, G (1976) Ising ferromagnet with biquadratic exchange. In: Physics Letters A, 58 (5). pp. 332-334.