More, Yogesh W Synthesis of 3,4-Dihydropyrano[c]chromenes Using Carbon Microsphere Supported Copper Nanoparticles (Cu-NP/C) Prepared from Loaded Cation Exchange Resin as a Catalyst. [electronic resource] - Current organic synthesis 2019 - 288-293 p. digital Publication Type: Journal Article ISSN: 1570-1794 Standard No.: 10.2174/1570179415666181116104931 doi