Ahmed, M Giasuddin, Syeda Asghari Ahmed, UKR Romman, Kawsari Akhter, Md Ershad Halim, Shamsun Naher, Md Aslam, and S Mosaddeq Ahmed. 2012. “A One-Pot Synthesis of 7,11-Diaryl-2,4-diazaspiro[5,5]undecane-3-Oxo (or Thioxo)-1,5,9-Triones”. Journal of the Bangladesh Chemical Society 24 (2):135-42. https://doi.org/10.3329/jbcs.v24i2.9702.