Shamsheer Yousaf of The New Indian Express has the (gory) details:
Probe Against NIT Director for Plagiarism: Outlines the story of a 2007 paper that was retracted by the publishers in 2008.
Thou Shalt Not Copy: Presents a summary of the instances of plagiarism committed by the authors of the 2007 paper. It's a good summary ["the Narayanan paper" in the excerpts below is the "original", published in 1996]:
The first three sentences of the introduction to the  paper have been lifted verbatim from the  Narayanan paper. Another two sentences that appears later in this section are also similar. This section also has two references to the original paper, though it has been placed next to text which incidentally does not refer to the original text
...The second section of the paper which runs to nearly a page, is where most of the alleged plagiarism has taken place. Barring two sentences, the entire section has been repeated verbatim from the Narayanan paper.
This is where a large part of the theory of the paper is developed. Crucially, there is no attribution anywhere to the Narayanan paper in this section.
... Most of the text in this section is a replica of the Narayanan paper. Though there is a reference to the Narayanan paper, it is placed at the end of the section, and does not clearly indicate that the text preceding it is from the same paper.
Two other stories accompany the main ones:
The first has excerpts from Prof. Sancheti's response.
The other has some snippets from the history of plagiarism by Indian scholars. At least three cases -- B.S. Rajput, Mashelkar, S. Selladurai -- should be familiar to longtime readers of this blog. I was not aware of the other two cases: Ranjit Singh and Kalyankumar.
Those of you who have access to the relevant journals can take a look at the 2007 paper, the 1996 original, and the editorial announcing the retraction of the former. The conclusion is quite inescapable, except for a minor wrinkle: even though extensive parts of the 2007 paper have been plagiarized with no citation whatsoever, other parts of that paper do indeed carry a citation to the original. But, the plagiarized part is so blatant -- you just have to look at Figure 1 in each paper -- that the editorial team's choice was already made for them!