Tsvetkova, I., & Borodzhieva, A.
().
Interactive methods for investigating frequency modulation applied in the educational process [Електронен ресурс]. // <I>EE&AE<D> : IEEE Proceedings 7th International conference on "Energy efficiency and agricultural engineering", Ruse, Bulgaria, 12-14 november 2020, Art. № 9278979, DOI: 10.1109/EEAE49144.2020.9278979.. (2346),