الإتاحة: https://doi.org/10.22323/1.420.0083Testhttps://hdl.handle.net/11583/2985922Testhttps://pos.sissa.it/420/083Test
الوصول الحر: http://arxiv.org/abs/1907.08218Test
الوصول الحر: https://escholarship.org/uc/item/4zq4d9c0Test
الإتاحة: https://doi.org/10.1140/epja/i2019-12885-0Testhttp://www.osti.gov/servlets/purl/1593121Testhttps://www.osti.gov/biblio/1593121Test
الإتاحة: http://purl.umn.edu/131486Test
الإتاحة: https://doi.org/10.1140/epja/i2019-12885-0Testhttp://hdl.handle.net/11582/320087Test