1. Process for the removal of sulfur from battery wreckers material using ammonium carbonate solutions;Acoveno,1975
2. Lead carbonate of high purity from crude lead sulfate;Yamada;Japan Tokkyo Koho,1974
3. Process for recycling junk lead-acid batteries;Elmore,1978
4. Desulfation of battery mud;Kolakowski,1981