Rubuta ci gaba don wannan sakin layi - Zeferino ya kammala a cikin 1998, 1999 da 2003 IAAF World Half Marathon Championships
ya gama 117th, 91st da 70th bi da bi kuma ya kammala a cikin 1999 da 2000 IAAF World Cross Country Championships <unk> Babban tseren maza inda ya gama a 141st da 145th wuri bi da bi.