Purnawan, I.; Hidayat, A. I.; Awaludin, S. .; Alivian, G. N. .; Sutrisna, E.; Kartiko, C.; Wirakhmi, I. N. . Smartphone-Based Spiritual Support Applications to Overcome Anxiety in Emergency Unit Nurses During the COVID-19 Pandemic: Extended Rapid Application Development. Open Access Maced J Med Sci 2023, 11, 90-97.