SHAHRISA, AZIZ, SHABNAM MOHAJERY, and KUMARTH HASANZADEH. 2010. “New Podand Derivatives of 4H-Pyran-4-Ones Possessing Sulfur Atoms”. Asian Journal of Chemistry 19 (2):999-1003. https://asianpubs.org/index.php/ajchem/article/view/20149.