 | ftp://ftp.cs.keele.ac.uk/pub/techreports/1992/tr92-07.ps, 19931119
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1993/tr93-21.ps, 19931119
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1993/tr93-07.ps, 19931119
|
| ftp://ftp.cs.keele.ac.uk/pub/techreports/1992/tr92-13.ps, 19931126
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1992/tr92-08.ps, 19931202
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1993/tr93-20.ps, 19931203
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1993/tr93-18.ps, 19931208
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1993/tr93-14.ps, 19940117
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1994/tr94-06.ps, 19940526
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1992/tr92-09.ps, 19940526
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1994/tr94-07.ps, 19940526
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1994/tr94-02.ps, 19940923
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1994/tr94-19.ps, 19950112
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1992/tr92-04.ps, 19950228
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1992/tr93-23.ps, 19950228
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1993/tr93-26.ps, 19950322
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1994/tr94-12.ps, 19950322
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1992/tr92-17.ps, 19950322
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1995/tr95-15.ps, 19951129
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1997/tr97-04.ps, 19970326
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| ftp://ftp.cs.keele.ac.uk/pub/techreports/1997/tr97-01.ps, 19970414
|
