The following publications are possibly variants of this publication:
- Extremal self-dual codes with the smallest covering radiusMasaaki Harada, Michio Ozeki. DM, 215:271-281, 2000. [doi]
- On the Covering Radius of Ternary Extremal Self-Dual CodesMasaaki Harada, Michio Ozeki, Kenichiro Tanabe. dcc, 33(2):149-158, 2004. [doi]
- On the classification of self-dual [20, 10, 9] codes over GF(7)Masaaki Harada, Akihiro Munemasa. ffa, 42:57-66, 2016. [doi]