I refer to your letter of 13 March, 2011.
refer to sth/sb as sth »The fixed price includes an amount of compensation, which is generally referred to as a concession or discount.
refer to sth/sb by sth »He was referring to the product by its generic name rather than using the brand name.
The new salary scale only refers to company managers and directors.
»These figures refer only to land for housing.
Taxpayers should refer to the chart listing deductions next to incomes.
»When I give my presentation, I will probably have to refer to my notes.
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