%0 Journal Article %A Mithu Saha %A Babulal Das %A Amarta Kumar Pal %T Synthesis of pyran derivatives under ultrasound irradiation using Ni nanoparticles as reusable catalysts in aqueous medium %J Comptes Rendus. Chimie %D 2013 %P 1079-1085 %V 16 %N 12 %I Elsevier %R 10.1016/j.crci.2013.05.012 %G en %F CRCHIM_2013__16_12_1079_0