Although at this time his main position was in the University of Kiev, he also taught at the Women's College from 1896 and at the Kiev Polytechnic Institute from 1898. He continued to teach at the Polytechnic Institute until 1926. He continued working at the University of Kiev until 1959 and retired at the age of 100. He received a number of scientific and state honors during his life, including the highest honors in the Soviet Union, the Order of Lenin and the Order of the Red Banner of Labour. Bukreev published a number of books which proved influential. For example, "Introduction to the theory of series," "Elements of the theory of determinants," "Course on definite integrals" (1903), and "Elements of algebraic analysis" (1912). In 1934, he published "An Introduction to the Calculus of Variations." His most important book on non-Euclidean geometry was "Non-Euclidean Planimetry in Analytic Terms", which he published in 1951. Bukreev continued actively working in mathematics up to the very end of his life; his last paper was published when he was 98. B.Y. Bukreev married a daughter of Aleksei Aleksandrovich Kozlov (Russian philosopher, a notable representative of Russian school of panpsychism, and professor of philosophy at Kiev University from 1884). They had three children, Tatiana, Nikolai and Evgenii. His grandson, Kirill Borisovich Tolpygo (son of Tatiana and Boris Nikolaevich Tolpygo), became a prominent Ukrainian physicist, corresponding member of the Academy of Sciences of Ukraine.