The first reason why you might see double square brackets in a structured reference is that the column headers they refer to contain a special character. In these cases, the extra pair of square ...

You can make a line graph in Excel in a matter of seconds using data already entered into the spreadsheet.

Abstract: Bound states in the continuum (BIC) is an important platform to achieve high quality (Q) factor resonance modes, and their excitation usually requires changing the size of the structure to ...