Abstract
AbstractHirsch‐type indices are studied with special attention to the AR2‐index introduced by Jin. The article consists of two parts: a theoretical part and a practical illustration. In the theoretical part, we recall the definition of the AR2‐index and show that an alternative definition, the so‐called AR21, does not have the properties expected for this type of index. A practical example shows the existence of some of these mathematical properties and illustrates the difference between different h‐type indices. Clearly the h‐index itself is the most robust of all. It is shown that excluding so‐called non‐WoS source articles may have a significant influence on the R‐and, especially, the g‐index.
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