Hulupi, R. 2006. Identification of Physiological Race Nematode, Radopholus similisCobb. that Attack Coffee Trees. Pelita Perkebunan (a Coffee and Cocoa Research Journal). 22, 3 (Dec. 2006). DOI:https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v22i3.45.