Hannu LaaksonenHosna KhajehNikos D. HatziargyriouAdvanced Distributed Energy Resources and On-Load Tap-Changer Control Principles for Enhanced Flexibility Services Provision.161768-161785202412IEEE Accesshttps://doi.org/10.1109/ACCESS.2024.3488211db/journals/access/access12.html#LaaksonenKH24streams/journals/access