1. Cho, I.: Hyponormality of Toeplitz operators with trigonometric polynomial symbols. Master Degree Thesis, Sungkyunkwan University (1999)
2. Cho, I.: Graph Groupoids and Partial Isometries. LAP Publisher. ISBN:978-3-8383-1397-9 (2009)
3. Cho, I., Jorgensen, P.E.T.: C *-Subalgebras generated by partial isometries. JMP. doi: 10.1063/1.3056588 (2009)
4. Cho I., Jorgensen P.E.T.: C *-Subalgebras generated by a single operator in B(H). ACTA Appl. Math. 108, 625–664 (2009)
5. Cho, I., Jorgensen, P.E.T.: Measure Framings on Graphs and Corresponding von Neumann Algebras. Preprint (2009)