Fibrila, F. .; Sulistyowati, S. .; Akhyar, M. .; Lestari, A. . The Benefits of Smartphone-Based Health Applications in Increasing Knowledge About Preconception Care: A Research and Development Study. Nusantara Sci. Tech. Proc. 2022, 1-6. https://doi.org/10.11594/nstp.2022.2601.