Petrunin, Anton Max Planck Institute for Mathematics, Max Planck Society;
https://doi.org/10.48550/arXiv.1903.08539 (Preprint)
https://doi.org/10.1090/gsm/236 (Publisher version)
1903.08539.pdf (Preprint), 3MB
Alexander, S., Kapovitch, V., & Petrunin, A. (2024). Alexandrov geometry: foundations. Providence, RI: American Mathematical Society.