Altmetrics of the Open Access Institutional Repositories: a webometrics approach. Scientometrics, (123)3:1181--1192, 2020. [PUMA: oa webometrics access institutional academic altmetrics metrics network open repository] URL
Next-generation metrics: Responsible metrics and evaluation for open science. Report of the European Commission Expert Group on Altmetrics. European Commission - Directorate-General for Research and Innovation, Brussels, 2017. [PUMA: science access european evaluation altmetrics commission europäische open eu kommission metriken]