Infima of d.r.e. Degrees. - Jiang Liu 002; Shengling Wang 002; Guohua Wu (CiE, 2009)

Infima of d.r.e. degrees. - Jiang Liu 002; Shengling Wang 002; Guohua Wu (Arch. Math. Log., 2010)

On a Hierarchy of Plus-Cupping Degrees. - Shengling Wang 002; Guohua Wu (CiE, 2011)