This list provides a quick overview of the landscape of open-source bibliographic software; both where is has been, but more importantly, where it may yet go.
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P. Woodland, J. Odell, V. Valtchev, and S. Young. Proceedings of the 1994 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2, page 125-128. Adelaide, Australia, (April 1994)