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This article (Allen 2014a) has been retracted by the publisher because it was published twice in error (Allen 2014b) during a change in production systems.
Originally published twice a week from Feb. 2, 1796-Feb.
It is published twice yearly, once during each academic semester.
The data is published twice a year, not annually.
The SCR will be published twice a year – May and December.
Energy Futures is published twice a year, featuring energy research and other energy activities at MIT.
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Nationally syndicated environmental newspaper columnist Edward Flattau has published twice-a-week commentary since 1972 and is the longest running columnist in the field.
DukeMed Alumni News is published twice a year by the Duke Medical Alumni Association.
However despite being published twice it remains largely unknown.
This article was mistakenly published twice.
Now published twice yearly, issues of the Journal are centered on a selected topic.
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