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From: SSteinberg.SoftArts@MIT-MULTICS@sri-unix.UUCP
Newsgroups: net.sf-lovers
Subject: Star Bright
Message-ID: <11821@sri-arpa.UUCP>
Date: Mon, 19-Sep-83 17:39:00 EDT
Article-I.D.: sri-arpa.11821
Posted: Mon Sep 19 17:39:00 1983
Date-Received: Mon, 26-Sep-83 02:11:30 EDT
Lines: 3

That was in the collection Tomorrow's Children collected by
Asimov.  Sorry no author.  The time travel mechanism seemed to
involve mobeus strips in higher dimensions.