Is it wise to use the paper reference numbers defined in CV in statement of purpose? If in my CV I assign to each paper of mine exactly one number, say [1] On ...; [2] On ..., and if I want to introduce my works in my statement of purpose, then is it wise to use these paper reference numbers in my statement of purpose?
Don't make anyone do extra work. They may not want to (or easily be able to) open a different file to find the reference. Give up part (1/4th?) of a page for references. Don't cram text in the main body, but references could be written with a (slightly) smaller/tighter font size/spacing if necessary.