Cabrera, D., Lu, S., Holmes, J., & Yadav, M. Sound Reflections in Indian Stepwells: Modelling Acoustically Retroreflective Architecture. 4, 227-247. https://doi.org/10.3390/acoustics4010014 Densil Cabrera Shuai Lu Jonothan Holmes Manuj YadavFDTD Architectural acoustics early reflections intangible heritage reflection retroreflection Room acoustics step-well