Avetisyan, A. A., et al. “THE SYNTHESE OF NEW DERIVATIVES OF UNSATURATED γ-LACTONES CONTAINING TETRAZOLE RING”. Proceedings of the YSU B: Chemical and Biological Sciences, vol. 38, no. 1 (203), Dec. 2003, pp. 76-79, doi:10.46991/PYSU:B/2004.38.1.076.