Publications

• Branched covering surface-knots with degree three have the simplifying numbers less than three, Topology Appl. 256 (2019), 26-45.


• Simplifying branched covering surface-knots by an addition of 1-handles with chart loops, J. Knot Theory Ramifications 27, 1850031, 29 p. (2018).



• Simplifying branched covering surface-knots by chart moves involving black vertices, Illinois J. Math. 61 (2017) no. 3-4, 497-515.



• On addition of 1-handles with chart loops to 2-dimensional braids, J. Knot Theory Ramifications 25, 1650061, 32 p. (2016).



• Showing distinctness of surface links by taking 2-dimensional braids, Pacific J. Math. 278 (2015), 235--251.



• Erratum to "On surface links whose link groups are abelian", (joint work with Tetsuya Ito), Math. Proc. Camb. Phil. Soc. 159 (2015), 187.



• On surface links whose link groups are abelian, (joint work with Tetsuya Ito), Math. Proc. Camb. Phil. Soc. 157 (2014), 63--77.



• Surface links with free abelian groups, J. Math. Soc. Japan 66, No. 1 (2014), 247--256.
  
  
• Satellites of an oriented surface link and their local moves, Topology Appl. 164 (2014), 113--124.


• Unknotting numbers and triple point cancelling numbers of torus-covering knots, J. Knot Theory Ramifications 22, No. 3, 1350010, 28 p. (2013).
  
  
• Unknotting the spun $T^2$-knot of a classical torus knot, Osaka J. Math. 49 (2012), 875--899.
  
  
• Braiding surface links which are coverings over the standard torus, J. Knot Theory Ramifications 21, No. 1, Article ID 1250011, 25p. (2012).
  
  
• Triple linking numbers and triple point numbers of certain $T^2$-links, Topology Appl. 159 (2012), 1439--1447.
  
  
• Surface links which are coverings over the standard torus, Algebr. Geom. Topol. 11 (2011), 1497--1540.
  
  
• Unknotting singular charts with no black vertices by reducing node-pairs, J. Knot Theory Ramifications 19, No.9 (2010), 1135--1144.
  
  
  

Preprints