When it comes to citing a statement or idea that has been previously mentioned, "as stated in" is a common phrase used. However, there are plenty of other synonyms that can be used in place of this phrase. Some alternatives for "as stated in" include "according to," "as per," "as mentioned previously," "in accordance with," "per the previous discussion," "based on," or "in line with." Using these synonyms not only adds variety to your writing but also enhances its clarity and concision. So, next time you need to refer to a previously stated idea, consider using one of these alternatives instead of relying on the same old phrase.