The paper "
Otagai," presented at WCCFL 1997, is still being revised on and off. Version 2.2.4 of this paper was circulated in 1997 here and there. but it is no longer being distributed. A substantially revised version of this is now called "The so-called reciprocal anaphor
otagai in Japanese and some implications." This new version addresses more directly than in Version 2.2.4 some methodological issues concerning how (I believe) we should proceed if we wish to make what we do an empirical science. Hoji 2003 (Lingua): sec. 4.2 contains some of the materials from the paper on
otagai; see also Ueyama 1998: Appendix A.3.1.