I would welcome comments on this 2006 paper, which I saw recently on Twitter:<div id="yMail_cursorElementTracker_1547448193283"><a id="linkextractor__1547448235609" data-yahoo-extracted-link="true" href="https://t.co/14R0F40egz">https://t.co/14R0F40egz</a><br></div><div id="yMail_cursorElementTracker_1547448235642">Regards,</div><div id="yMail_cursorElementTracker_1547448248391">Ash</div><div id="yMail_cursorElementTracker_1547448195841"><div id="yMail_cursorElementTracker_1547448138695"><div id="yMail_cursorElementTracker_1547448105776"><br><br><div id="ymail_android_signature"><a href="https://go.onelink.me/107872968?pid=InProduct&amp;c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&amp;af_wl=ym&amp;af_sub1=Internal&amp;af_sub2=Global_YGrowth&amp;af_sub3=EmailSignature" id="yMail_cursorElementTracker_1547448109034">Sent from Yahoo Mail on Android</a></div></div></div></div>
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