an ordinary chessplayer wrote on 03/20/18 at 01:46:53:
I agree with you that I have not seen "complete" coverage of 4...dxc4 anywhere.
Not a book, but Part 2 of Gustafsson's "Black Repertoire vs 1.d4" Series on chess24 covers the Vienna.
However, he has also stated that it is definitely "the weak spot" of the repertoire (mostly because of the line I mentioned) and that he would now probably recommend the Ragozin (with the Vienna transposition after Bg5) instead, if he could start from scratch.
Of course this isn't a forced loss, and eg Caruana was unafraid to enter the Vienna via the classic moveorder against Aronian in the Candidates -with Levon not testing the prep against Bc4:, but just going for Bg5- but that even moreso would make some coverage of it very interesting to me.
And again, I am not sure how to fill 400 pages with the position after 4. ..Bb4 5.Bg5 6.dc4: alone - Pert covers this in 90!
.. in fact, with the entire Ragozin on top + the funny 3.Nc3 Bb4 line + the Catalan, his book clocks in at 430 pages total, without leaving a feeling of having cut all too many corners.
To be fair, Pert only had to cover his ...Qa5 recommendation, and got to ignore the main body of theory with ...Bxc3+ etc.