Albeverio, S., S. N. Lakaev, and T. H. Rasulov. “The Efimov Effect for a Model Operator Associated With the Hamiltonian of a Non Conserved Number of Particles”. Methods of Functional Analysis and Topology 13, no. 1 (March 25, 2007): 1–16. Accessed December 16, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/332.