@unpublished{ITNYREPOID520, title = {Alat ukur jarak petir}, school = {INSTITUT TEKNOLOGI NASIONAL yOGYAKARTA}, author = {310098024 ORI SETIO UTOMO}, month = {July}, year = {2002}, url = {https://repository.itny.ac.id/id/eprint/520/}, keywords = {PETIR} }