Occasionally there is a new DLC that does not have an authorized form and one will need to be created using RDA guidelines (Chapter 11, Section 2): http://access.rdatoolkit.org/.
For editing titles and abstracts to include symbols, special characters and scientific notation:
Most computers should have a character map as well. For Windows 10 users, search character map on the taskbar and the query should return results for the character map.