Kaufman, M.; Griffiths, R.; Yeomans, J.; Fisher, M. (1981). "Three-component model and tricritical points: A renormalization-group study. Two dimensions". Physical Review B. 23 (7): 3448–3459. Bibcode:1981PhRvB..23.3448K. doi:10.1103/PhysRevB.23.3448.
Kaufman, M.; Griffiths, R.; Yeomans, J.; Fisher, M. (1981). "Three-component model and tricritical points: A renormalization-group study. Two dimensions". Physical Review B. 23 (7): 3448–3459. Bibcode:1981PhRvB..23.3448K. doi:10.1103/PhysRevB.23.3448.