Algorithm for adaptive observation based on method of instrumental variables Nikola Nikolov, Mariela Alexandrova, Shakhnoza Ubaydullayeva, Rano Gaziyeva, Khafizova Zulfiya and Dilorom Ubaydullayeva E3S Web of Conf., 401 (2023) 04003 Published online: 11 July 2023 DOI: 10.1051/e3sconf/202340104003