16.Thelwall, M. (2016b). Are there too many uncited articles? Zero inflated variants of the discretised lognormal and hooked power law distributions. Journal of Informetrics, 10(2), 622-633.
17.Wan, X., & Liu, F. (2014a). Are all literature citations equally important? Automatic citation strength estimation and its applications. Journal of the Association for Information Science and Technology, 65, 1929-1938.