1. Applications of static electricity in coal and ore beneficiation;Alfano;J. Electrost.,1985
2. Progress in triboelectric separation of minerals;Alfano,1988
3. Technical and economical problems connected with the dry cleaning of raw coal and in particular with pyrite removal by means of electric separation;Carta,1976
4. Sul caricamento triboelettrico dei minerali in relazione allo stato elettrnico delle loro superfici;Ciccu;L' Industr. Miner.,1968
5. Tribocharging studies of ground coal matter;Ciccu,1991