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...w.cl.cam.ac.uk/~nad10/pubs/jma12.pdf |quote=over the course [of] the early 1980s, Riley's patterns moved from more regular to more random (as characterised ...er rectangle.<ref>[http://www1.ttcn.ne.jp/~a-nishi/ The World of Geometric Toys], ''[http://www1.ttcn.ne.jp/~a-nishi/spring/z_spring.html Origami Spring]'' ...

...industry. World production capacity of BPA was 1&nbsp;million tons in the 1980s,<ref name="Fiege">{{cite encyclopedia|author1=Fiege H |author2=Voges H-W |a ...can also occur in infants through ingestion by chewing on certain books or toys. ...

...ndish gravitational constant", appears to have been common in the 1970s to 1980s, especially in (translations from) Soviet-era Russian literature, e.g. Sagi ...