Purvins, Arturs; Klebow, Birthe: 'Technical grid connection guides for distributed electricity generation systems: a new DERlab database has come alive', IET Renewable Power Generation, 2015, 9, (8), p. 1087-1092, DOI: 10.1049/iet-rpg.2015.0057
IET Digital Library, https://digital-library.theiet.org/;jsessionid=3bpksrird6mbn.x-iet-live-01content/journals/10.1049/iet-rpg.2015.0057