Source: https://www.researchgate.net/profile/H-Ben-Ahmed/publication/278816634_Le_genie_electrique_dans_le_vent_recherches_dans_le_domaine_de_la_generation_eolienne/links/5643200e08ae9f9c13e01fd1/Le-genie-electrique-dans-le-vent-recherches-dans-le-domaine-de-la-generation-eolienne.pdf