author: Michael V Knopp  Steven G. E. Marsh 

https://wjso.biomedcentral.com/articles/10.1186/1477-7819-5-80

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copyrighted in Singapore.

copyrighted in Argentina.

copyrighted in Trinidad and Tobago.

copyrighted in Saint Vincent and the Grenadines.

copyrighted in United States.

copyrighted in Uruguay.

copyrighted in Bulgaria.

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copyrighted in Nauru.

copyrighted in Austria.

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copyrighted in Bosnia and Herzegovina.

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copyrighted in Malta.

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

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copyrighted in countries with 50 years pma or shorter.

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copyrighted in countries with 71.5 years copyright term after publication.

copyrighted in countries with 25 years pma.

copyrighted in countries with 45 years pma or shorter.

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copyrighted in countries with 90 years pma or shorter.

copyrighted in countries with 25 years copyright term after publication.

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copyrighted in countries with 50 years pma.

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copyrighted in countries with 90 years pma.

copyrighted in countries with longer than 90 years pma.

copyrighted in countries with longer than 100 years pma.

copyrighted in countries with 15 years pma.

copyrighted in countries with 45 years pma.

copyrighted in countries with longer than 50 years pma.

copyrighted in countries with 85 years pma or shorter.

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copyrighted in countries with longer than 95 years pma.

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copyrighted in countries with 80 years pma.

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 50 years copyright term after publication.

copyrighted in countries with 78 years pma.

copyrighted in countries with 95 years pma.