[1] Menasco W. Closed incompressible surfaces in alternating knot and link complements. Topology, 1984, 23: 275-299

[2] Short H. Some closed incompressible surfaces in knot complements which survive surgery. London Math Soc Lect Note, 1985, 67: 179--194

[3]  Swarup G. On incompressible surfaces in the complements of knots.  J Indian Math Soc, 1973, 37: 9--24

[4]  Han Y F. Incompressible pairwise incompressible surfaces in link complements. Acta Mathematica Scientia, 2011, 31B(3): 1011--1019

[5]  Qiu R F, Du K, Ma J M, Zhang M X. Heegaard genera of annular 3-manifolds. Journal of Knot Theory and Its Ramifications, 2011, 20: 547--566

[6]  Qiu R F, Wang S C, Zhang M X. Additivity of Heegaard genera of bounded surface sums. Topology and its Application, 2010, 157: 1593--1601

[7]  Li F L, Yang G Q, Lei F C. Heegaard genera of high distance are additive under annulus sum. Topology and its Application, 2010, 157: 1188--1194

[8]  Lyon H C. Incompressible surfaces in Knot spaces. Transactions of the American Mathematical Society, 1971, 157: 53--62

[9]  Scharlemmann M. Proximity in the curve complex: boundary reduction and bicompressible surfaces. Pacific J Math, 2006, 228: 325--348

[10]  Hempel J. 3-Manifolds. Princeton: Princeton University Press, 1976

[11]  Jaco W. Lectures on Three-manifold Topology. Regional Conference Series in Mathematics 43. Providence RI:  Amer Math Soc