Syahwir, I. D., Samsi, A., Firmansyah, V., Yunanto, P. W., Maheswara, R., & Anggraeni, N. P. (2019). INTERNET OF THINGS OF ELECTRONIC SEAL BASE ON GPRS SHORT MESSAGE SERVICE AND THINGSPEAK. Spektra: Jurnal Fisika Dan Aplikasinya, 4(3), 125 - 132. https://doi.org/10.21009/SPEKTRA.043.03