@misc{oai:repository.dl.itc.u-tokyo.ac.jp:00039389,
 author = {Matsumoto, S. and Morita, S.},
 month = {},
 note = {original version: jfs370217_original.pdf, revised version (September 2013): jfs370217_revised2013sep.pdf},
 title = {Mathematical Contributions of Professor Akio Hattori},
 year = {1990}
}