1. Defined structural and performance criteria would facilitate the validation and acceptance of alternative test procedures;Balls;ATLA,1997
2. Statement on the scientific validity of the 3T3 NRU PT test (an in vitro test for phototoxic potential);Balls;ATLA,1998
3. Report and recommendations of the CAAT/ERGATT workshop on the validation of toxicity test procedures;Balls;ATLA,1990
4. The EC/HO international validation study on alternatives to the Draize eye irritation test;Balls;Toxicology in Vitro,1995
5. Balls, M., Blaauboer, B.J., Fentem, J., Bruner, L., Combes, R.D., Ekwal, B., Fielder, R.J., Guillouzo, A., Lewis, R.W., Lovell, D.P., Reinhardt, C.A., Repetto, G., Sladowski, D., Spielmann, H., Zucco, F., 1995b. Practical aspects of the validation of toxicity test procedures. The report and recommendations of ECVAM Workshop 5. ATLA 23, 129–147.