HRTUS, Martin Dominik. Prague postal time service: clock and sirens – improbable connection. Acta Polytechnica, Prague, Czech Republic, v. 64, n. 3, p. 226–236, 2024. DOI: 10.14311/AP.2024.64.0226. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/9664. Acesso em: 3 apr. 2025.