The following publications are possibly variants of this publication:
- Relating Equivalence and Reducibility to Sparse SetsEric Allender, Lane A. Hemachandra, Mitsunori Ogiwara, Osamu Watanabe. SICOMP, 21(3):521-539, 1992.
- Statement map: reducing web information credibility noise through opinion classificationKoji Murakami, Eric Nichols, Junta Mizuno, Yotaro Watanabe, Shouko Masuda, Hayato Goto, Megumi Ohki, Chitose Sao, Suguru Matsuyoshi, Kentaro Inui, Yuji Matsumoto. and 2010: 59-66 [doi]