1. D.J. Spiers, J. Royer, Guidelines for the Use of Batteries in Photovoltaic Systems. Joint publication, NAPS, Vantaa, Finland and CANMET, Varennes, Canada, 1998.
2. Predicting the service lifetime of lead/acid batteries in photovoltaic systems;Spiers;J. Power Sources,1995
3. Limits to battery lifetime in photovoltaic applications;Spiers;Solar Energy,1996
4. D.J. Spiers, Understanding the factors that limit battery life in PV systems. Proceedings of the World Renewable Energy Congress VI (WREC2000), Elsevier Science Ltd., Vol. II, 2000, pp. 718–723.
5. Directive 2006/66/EC of the European Parliament and of the Council of 6 September 2006 on batteries and accumulators and waste batteries and accumulators and repealing Directive 91/157/EEC