Some multi-set inclusions associated with shuffle convolutions and multiple zeta values. - Douglas Bowman; David M. Bradley; Ji Hoon Ryoo (Eur. J. Comb., 2003)

Efficiency of Cluster Validity Indexes in Fuzzy Clusterwise Generalized Structured Component Analysis. - Ji Hoon Ryoo; Seohee Park; Seongeun Kim; Hyun Suk Ryoo (Symmetry, 2020)