author: Katie Doores  Mark R Wormald 

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copyrighted in countries which use the rule of the shorter term.

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copyrighted in countries with longer than 50 years pma.

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copyrighted in countries with 71.5 years copyright term after publication.

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copyrighted in countries with 45 years pma.

copyrighted in countries with 85 years pma or shorter.

copyrighted in countries with 15 years pma or shorter.

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copyrighted in countries with longer than 95 years pma.

copyrighted in countries with 74 years pma or shorter.

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copyrighted in countries with 60 years pma.

copyrighted in countries with 74 years pma.

copyrighted in countries with 100 years pma.

copyrighted in countries with 78 years pma.

copyrighted in countries with 95 years pma.