(with D. Futer), in progress. .

(with D. Futer and J. Purcell), in preparation.

(with D. Futer and J. Purcell).
Postcript file and PDF file , ArXiv

(with O. Dasbach, D. Futer, X.-S. Lin and N. Stoltzfus)
PDF file. ArXiv

Postcript file and PDF file. ArXiv

PDF file. ArXiv

(with O. Dasbach, D. Futer, X.-S. Lin and N. Stoltzfus),
Journal of Combinatorial Theory Ser. B , Vol. 98, Issue 2, 384-399(2008).
PDF file. ArXiv.

(with D. Futer and J. Purcell), Journal of Differential Geometry, Vol 78, no 3, 429-464 (2008).
PDF file.ArXiv

(With Xiao-Song Lin),
Transactions of the American Math. Soc., Vol. 360, 3249-3261 (2008).
Postcript fileand PDF file.

(With Xiao-Song Lin),
J. of Knot Theory and its Ramifications, Vol. 16 (10),1295-1329 ( 2007).
Special Volume in honor of L. Kauffman's 60th birthday ( Eds. J. Przytycki, S. Lampropoulou).
Postcript file and PDF file , ArXiv.

(With Xiao-Song Lin),  Pacific Journal of Math., Vol. 228, No. 2, 251-276 (2006).
Postcript file and PDF file,

Algebraic and Geometric Topology, Vol. 4 (48), 1111-1123(2004).
Postcript file

J. of Knot Theory and its Ramifications,; Vol. 13 (4),441-456 ( 2004).
Postcript file

(With Xiao-Song Lin),  Topology and Its Applications,   Vol. 138 (3), 207-217 (2004).
Postcript file

(With Nikos Askitas) ,Topology and Its Applications, Vol.126 (1-2), 63-81 (2002).
Postcript file

Topology and Its Applications, Vol. 101 (2), 107-119 (2000).
Postcript file

J. of Knot Theory and its Ramifications, Vol 7 (2), 173-185(1998).
Postcript file

(With Xiao-Song Lin) Mathematical Research Letters 5, 293-304(1998).
Postcript file

(With Xiao-Song Lin) Topology Vol 38 (1), 95-115 (1999).

Topology Vol 37 (3), 673-707 (1998).

Mathematical Research Letters 4, 341-347 (1997).

Ph.D Thesis, Columbia University, NY, (1995).

J. of Knot Theory and its Ramifications, Vol 3 (3), 431--432 (1994).

J. of Knot Theory and its Ramifications, Vol 2 (4), 431-451(1993).