Jump inversions of algebraic structures and Σ-definability

Marat Kh. Faizrahmanov, Asher M. Kach, Iskander Sh. Kalimullin, Antonio Montalbán, Vadim Puzarenko. Jump inversions of algebraic structures and Σ-definability. Math. Log. Q., 65(1):37-45, 2019. [doi]