Exact(59)
The analysis of the publication years of the references cited by all the papers in a specific research field shows that (earlier) publication years are not equally represented.
The analysis of severe non-fatal accidents included the publication years 1994 2004.
We analyze the reference publication years (RPYs) between 1950 and 1990.
In the third and final step, the reference publication years are analyzed for frequently cited publications.
Although indexing takes some time, we can expect that the publication years until 2014 are nearly complete.
The years appear as pronounced peaks in the distribution of the reference publication years (i.e. the RPYS spectrum).
Again, the search period was limited to the publication years of reviewed EDA studies (2004 to 2014).
Publication years ranged from 1975 to 2015, and the majority of trials (59%) took place in Europe.
However, reference publication years younger than 1990 require a different technical treatment because of the exponential increase of the number of publications and cited references.
The search period was limited to between 2004 and 2014, to be in agreement with the publication years of EDA studies evaluated in this review.
Again, the decline or slowed growth rate in the years 2013 and 2014 is probably caused by the delayed indexing for the recent publication years.
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