G. S. Tian and T. H. Lin, "Quasi-one-dimensional Organic Unsaturated Ferromagnetism: Some Rigorous Results'', Phys. Rev. B 53, 8196 (1996).

G. S. Tian, "A Sufficient Condition for Two Long-range Orders Coexisting in a Lattice Many-body System'', J. Phys. A: Math. Gen. 30, 841 (1997).

G. S. Tian, "Ferrimagnetism in a One-dimensional Heisenberg Model'', Phys. Rev. B 56, 5355 (1997).

G. S. Tian, "The Binding Energy and the Charged Gaps in the Negative-$U$ Hubbard Model: Some RigorousResults'', J. Phys. A: Math. Gen. 30, 5329 (1997).

G. S. Tian, "Charged and Spin-excitation Gaps in Half-filled Strongly Correlated Electron Systems: A Rigorous Result'', Phys. Rev. B 58, 7612 (1998).

G. S. Tian and L. H. Tang, "Parity Effect in a Small Superconducting Grain: A Rigorous Result'', Phys. Rev. B 58, 12333 (1998).

G. S. Tian and L. H. Tang, "General result on charged and spin-excitation gaps in strongly correlated electron systems at half filling'', Phys. Rev. B 60, 11336 (1999).