1Paulo Henrique Trombetta Zannin,Carolina Reich Marcon.Objective and subjective evaluation of the acoustic comfort in classrooms[J].Applied Ergonomics,2007(38):675-680.
2ANSI S12.60.American National Standard-acoustical performance criteria,design requirements,and guidelines for schools,2002.
3Brazilian Association for Standardization NBR 12179.Acoustic comfort in closed rooms(in Portuguese),1992.