Zhang Fu; Jack Heidel. Non-chaotic behaviour in three-dimensional quadratic systems (англ.) // Nonlinearity : journal. — 1997. — Vol. 10, no. 5. — P. 1289—1303. — doi:10.1088/0951-7715/10/5/014. — Bibcode: 1997Nonli..10.1289F.
Jack Heidel; Zhang Fu. Nonchaotic behaviour in three-dimensional quadratic systems II. The conservative case (англ.) // Nonlinearity : journal. — 1999. — Vol. 12, no. 3. — P. 617—633. — doi:10.1088/0951-7715/12/3/012. — Bibcode: 1999Nonli..12..617H.
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Zhang Fu; Jack Heidel. Non-chaotic behaviour in three-dimensional quadratic systems (англ.) // Nonlinearity : journal. — 1997. — Vol. 10, no. 5. — P. 1289—1303. — doi:10.1088/0951-7715/10/5/014. — Bibcode: 1997Nonli..10.1289F.
Jack Heidel; Zhang Fu. Nonchaotic behaviour in three-dimensional quadratic systems II. The conservative case (англ.) // Nonlinearity : journal. — 1999. — Vol. 12, no. 3. — P. 617—633. — doi:10.1088/0951-7715/12/3/012. — Bibcode: 1999Nonli..12..617H.