On 3-Adic Valuations of Generalized Harmonic Numbers. - Ken Kamano (Integers, 2011)

Weighted Lonesum Matrices and Their Generating Function. - Ken Kamano; Yasuo Ohno; Shuji Yamamoto (Integers, 2013)

Lonesum decomposable matrices. - Ken Kamano (Discret. Math., 2018)