1. American Society for Testing and Materials (ASTM). 2011. Standard specification for volatile N-nitrosamine levels in rubber nipples on pacifiers. F1313-1390.
2. European Committee for Standardization (CEN). 1999. Child use and care articles – method for determining the release of N-nitrosamines and N-nitrosatable substances from elastomer or rubber teats and soothers. EN 12868.
3. European Committee for Standardization (CEN). 2002. Child use and care articles soother for babies and young children part 3: chemical requirements and tests. EN 1400–3.
4. European Committee for Standardization (CEN). 2016. Safety of toys – part 12: N-Nitrosamines and N-nitrosatable substances. EN 71–12.