Juola, Patrick; Zimmermann, Philip. Whole-Word Phonetic Distances and the PGPfone Alphabet(PDF). Proceedings of the International Conference of Spoken Language Processing (ICSLP-96). 1996 [2016-03-15]. (原始内容存档(PDF)于2016-03-03).
Juola, Patrick. Isolated Word Confusion Metrics and the PGPfone Alphabet. Proceedings of New Methods in Language Processing 2 (Ankara, Turkey: Oxford University, Dept. of Experimental Psychology). 1996 [2016-03-15]. (原始内容存档于2016-02-23).
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Juola, Patrick; Zimmermann, Philip. Whole-Word Phonetic Distances and the PGPfone Alphabet(PDF). Proceedings of the International Conference of Spoken Language Processing (ICSLP-96). 1996 [2016-03-15]. (原始内容存档(PDF)于2016-03-03).
Juola, Patrick. Isolated Word Confusion Metrics and the PGPfone Alphabet. Proceedings of New Methods in Language Processing 2 (Ankara, Turkey: Oxford University, Dept. of Experimental Psychology). 1996 [2016-03-15]. (原始内容存档于2016-02-23).