On Soddy's Hexlet and a Linked 4-Pair. - Hiroshi Maehara; Ai Oshiro (JCDCG, 1998)

On Knotted Necklaces of Pearls. - Hiroshi Maehara; Ai Oshiro (Eur. J. Comb., 1999)

Piercing Balls Sitting on a Table by a Vertical Line. - Hiroshi Maehara; Ai Oshiro (Eur. J. Comb., 2000)

Cutting a Set of Disks by a Line with Leaving Many Intact Disks in Both Sides. - Hiroshi Maehara; Ai Oshiro (J. Comb. Theory A, 2000)

Cutting a Bunch of Grapes by a Plane. - Hiroshi Maehara; Ai Oshiro (Eur. J. Comb., 2001)

Piercing a Set of Disjoint Balls by a Line. - Hiroshi Maehara; Ai Oshiro (J. Comb. Theory A, 2001)

Arranging Solid Balls to Represent a Graph. - Hiroshi Maehara; Ai Oshiro (Graphs Comb., 2002)