Ridayati, Solikhah Retno Hidayati. Model Matematika untuk Usaha Kecil Menengah Saat Pandemi COVID-19 di Kabupaten Kulon Progo. Prosiding Seminar Nasional ReTII [Internet]. 2023Nov.11 [cited 2025Apr.15];18(1):994-7. Available from: https://journal.itny.ac.id/index.php/ReTII/article/view/4642