Arif Fatahillah, Dafik, Ervin Eka Riastutik, Susanto (InaCombS (Indonesian Combinatorials Society), Universitas Islam Malang, 2014-06-09)
One of the Indonesia major export commodity is a coffee
bean. The field expansion have been focused several years ago to
increase the productivity, but it does not give a significant
effect. One of the factors that ...