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- 27. Polish Standard PN-Z-15011-3:2001.
- 28. Polish Standard PN-88/C-87105.
- 29. Polish Standard PN-Z-15011-3:2001.
- 30. Polish Standard a PN-Z-93/C-87085.
- 31. Polish Standard PN-80/G-04511.
- 32. Polish Standard PN-80/G-04512.
- 33. Polish Standard PN-81/G-4513.