How well developed are altmetrics? A cross-disciplinary analysis of the presence of ‘alternative metrics’ in scientific publications

Z. Zahedi, R. Costas, and P. Wouters, “How well developed are altmetrics? A cross-disciplinary analysis of the presence of ‘alternative metrics’ in scientific publications,” Scientometrics, vol. 101, no. 2, pp. 1491–1513, 2014.