https://roto.staff.ugm.ac.id/2016-04-27T13:00:54+07:00https://roto.staff.ugm.ac.id/research/2020-11-06T06:52:41+07:00https://roto.staff.ugm.ac.id/publication/2020-11-06T06:49:25+07:00https://roto.staff.ugm.ac.id/teaching/2016-03-01T22:27:10+07:00