Lindl, Toni, et al. “Guidance on Determining Indispensability and Balancing Potential Benefits of Animal Experiments With Costs to the Animals With Specific Consideration of EU Directive 2010 63 EU”. ALTEX - Alternatives to Animal Experimentation, vol. 29, no. 2, May 2012, pp. 219-28, doi:10.14573/altex.2012.2.219.