Existence of 4-GDDs with at most 50 points and 4-GDDs of types 6s3t and 9s3t. - R. Julian R. Abel; Yudhistira A. Bunjamin; Diana Combe (Discret. Math., 2021)

Difference matrices with five rows over finite abelian groups. - Rong Pan; R. Julian R. Abel; Yudhistira A. Bunjamin; Tao Feng 002; Tiana J. Tsang Ung; Xiaomiao Wang (Des. Codes Cryptogr., 2022)

Group divisible designs with block size 4 where the group sizes are congruent to 2 mod 3. - R. Julian R. Abel; Thomas Britz; Yudhistira A. Bunjamin; Diana Combe (Discret. Math., 2022)

The 4-GDDs of type 3562. - R. Julian R. Abel; Yudhistira A. Bunjamin; Diana Combe (Discret. Math., 2022)

Group divisible designs with block size 4 where the group sizes are congruent to 1 mod 3. - R. Julian R. Abel; Thomas Britz; Yudhistira A. Bunjamin; Diana Combe; Tao Feng 002 (Discret. Math., 2023)

Group divisible designs with block size 4 and group sizes 4 and 10 and some other 4-GDDs. - Changyuan Wang; R. Julian R. Abel; Thomas Britz; Yudhistira A. Bunjamin; Diana Combe (Discret. Math., 2025)