List of Articles Crypto currency Open Access Article Abstract Page Full-Text 1 - Long memory in four main cryptocurrencies gholamreza zomorodian Babak Mahboubi 10.30495/jfksa.2022.20209 Open Access Article Abstract Page Full-Text 2 - Estimating the Investment Risk in a Digital Currency Portfolio and Optimizing it Using Value at Risk Ahmad Aghamohammadi Fereydoon Ohadi Mohsen Seighaly Bahman Banimahd Open Access Article Abstract Page Full-Text 3 - Economic Modeling of Restricting the cryptocurrency market on ransomware attacks Mehran Garmehi Sarah Rahimi Devin 10.30495/eco.2021.1907003.2406 Open Access Article Abstract Page Full-Text 4 - A Survey of Long-Term Memory in the Digital Currency Index Shima Alizadeh hossein safarzadeh