Chochikyan, T.V. et al. 2010. SYNTHESIS OF NEW SPIROHETERYL-SUBSTITUTED BUTANOLIDES . Proceedings of the YSU B: Chemical and Biological Sciences. 44, 2 (222) (May 2010), 28–32. DOI:https://doi.org/10.46991/PYSU:B/2010.44.2.028.