This is pBibTeX, Version 0.99d-j0.33 (utf8.euc) (TeX Live 2017)
Capacity: max_strings=100000, hash_size=100000, hash_prime=85009
The top-level auxiliary file: sigos.aux
The style file: ipsjunsrt.bst
Database file #1: ref.bib
You've used 2 entries,
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