BABILong: Testing the Limits of LLMs with Long Context Reasoning-in-a-Haystack - Kuratov, Yuri; Bulatov, Aydar; Anokhin, Petr; Rodkin, Ivan; Sorokin, Dmitry; Sorokin, Artyom; Burtsev, Mikhail (Advances in Neural Information Processing Systems, 2024)