TY - BOOK ED - The Directory of Open Access Journals TI - Universe SN - 2218-1997 CY - Switzerland PB - MDPI AG KW - Black holes KW - Quantum field theory KW - Quantum mechanics KW - Theoretical particle physics KW - Quantum gravity UR - http://www.mdpi.com/journal/universe UR - https://doaj.org/toc/9f425d86b4264057a6825e335e2fe50a ER -