Saragih RS, Lumbantobing ST, Simamora BA, Purba YO, Nadeak V, Samosir JC. Desa Mandiri Energi Dan Pertanian 4.0: Penerapan Iot, Edukasi Energi Surya, dan Model Koperasi Agro-Ekonomi di Kecamatan Purba Kabupaten Simalungun. SAMBARA: PKM [Internet]. 2026 Jun. 24 [cited 2026 Jun. 24];4(2):642-7. Available from: https://putrapublisher.org/index.php/sambara/article/view/1921