When using latex to add references, if you encounter package natbib error: How to understand ytd and mtd indicators ytd (year to date) and mtd (month to date) are two time period indicators commonly used in financial analysis and business management. The understanding is as follows: 1. ytd (year to date) is determined. Perhaps year over year is specific to only referring to the last year.
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(natbib) press to continue in numerical citation style.