If you steal from one author, it's plagiarism. If you steal from two, it's research.

If you steal from one author it's plagiarism; if you steal from many it's research.

To steal ideas from one person is plagiarism. To steal from many is research.

For such kind of borrowing as this, if it be not bettered by the borrower, among good authors is accounted plagiary.

Copy from one, it's plagiarism; copy from two, it's research.

I am never forget the day I first meet the great Lobachevsky.
In one word he told me secret of success in mathematics:
Plagiarize!

Plagiarize!
Let no one else's work evade your eyes!
Remember why the good Lord made your eyes!
So don't shade your eyes,
But plagiarize, plagiarize, plagiarize -
Only be sure always to call it please 'research'."

[Lobachevsky]