Ningsih, K. P. .; Purbobinuko, Z. K. .; Pradipta, D. A. .; Farhan, I. M. .; Rohmah, K. L. . Klakson: Innovation in the Development of a Barber Johnson Charting Calculator Based on an Early Warning System (EWS). PELS 2024, 6, 268-273.