García Vallejo, F., Bonilla, R., Gallego, G., Rugeles, M. T. and Borrero, I. (1992) “Amplification of human lymphotropic virus 1 (HTLV-1) DNA segments in patients with tropical spastic paraparesis and asymptomatic seropositive patients”, Colombia Medica, 23(2), pp. 50–56. doi: 10.25100/cm.v23i2.6339.