Boyack, Kevin W.; Patek, Michael; Ungar, Lyle H.; Yoon, … - In: Journal of Informetrics 8 (2014) 1, pp. 1-12
A system of four research levels, designed to classify scientific journals from most applied to most basic, was introduced by Francis Narin and colleagues in the 1970s. Research levels have been used since that time to characterize research at institutional and departmental levels. Currently,...