%0 Journal Article %T Metal free synthesis of tetrahydrobenzo[a] xanthenes using orange peel as a natural and low cost efficient heterogeneous catalyst %A Taghavi, Faezeh %A Gholizadeh, Mostafa %A SHokooh Saljooghi, Amir %A Mohammad Ramezani %J RSC Advances %@ 2046-2069 %D 2016