List of Articles Solid acids Open Access Article Abstract Page Full-Text 1 - Nano-silica supported ethane-sulfonic acid: An efficient heterogeneous solid acid catalyst for one-pot synthesis of xanthene and acridine derivatives Zohreh Loghemani Jahromi Hassan Zare Open Access Article Abstract Page Full-Text 2 - Silica-bonded n-propyldiethylenetriamine sulfamic acid as a recyclable solid acid catalyst for the synthesis of coumarin and biscoumarin derivatives Khodabakhsh Niknam Seyed Ahmad Sajadi Roghayeh Hosseini Mojtaba Baghernejad