A variant of inclusion-exclusion on semilattices. - Hiroshi Narushima; Hiroshi Era (Discret. Math., 1978)

Balancing signed graphs. - Jin Akiyama; David Avis; Vasek Chvátal; Hiroshi Era (Discret. Appl. Math., 1981)

Further results on graph equations for line graphs and n-th power graphs. - Jin Akiyama; Hiroshi Era; Geoffrey Exoo (Discret. Math., 1981)

The cohesiveness of a point of a graph. - Jin Akiyama; Frank Boesch; Hiroshi Era; Frank Harary; Ralph Tindell (Networks, 1981)

Path chromatic numbers of graphs. - Jin Akiyama; Hiroshi Era; Severino Villanueva Gervacio; Mamoru Watanabe (J. Graph Theory, 1989)

On upper bound graphs whose complements are also upper bound graphs. - Hiroshi Era; Morimasa Tsuchiya (Discret. Math., 1998)

On upper bound graphs with respect to operations on graphs. - Hiroshi Era; Kenjiro Ogawa; Morimasa Tsuchiya (Theor. Comput. Sci., 2000)

On transformations of posets which have the same bound graph. - Hiroshi Era; Kenjiro Ogawa; Morimasa Tsuchiya (Discret. Math., 2001)

A note on construction of upper bound graphs. - Hiroshi Era; Shin-ichi Iwai; Kenjiro Ogawa; Morimasa Tsuchiya (Electron. Notes Discret. Math., 2002)

Note on transformation of posets with the same semi bound graphs. - Hiroshi Era; Kenjiro Ogawa; Morimasa Tsuchiya (Ars Comb., 2005)

On upper bound graphs with forbidden subposets. - Hiroshi Era; Kenjiro Ogawa; Satoshi Tagusari; Morimasa Tsuchiya (Electron. Notes Discret. Math., 2005)