When taking notes in my research notebook, I often end up citing many papers because the paper I am writing a summary of has cited them: I want to record adequate justification of each claim, and I want to be able to track down the sources if I need to in the future.
However, it is not practical for me to stop and read every reference the current paper is citing. Therefore, some of my the references in my notebook I have read, and some I have not read. This bothers me, because they are not explicitly marked as such in the actual document.
How can I cite my Bibtex sources (I am actually using JabRef with biber under Miktex/Texstudio) in such a way that I can distinguish those I have read from those I haven't?
What logical levels I want
Ideally, I would like three classes:
- References I have read
- References I haven't read but intend to read
- References I haven't read and don't plan to
But if only binary discrimination is possible, the last two can be collapsed into a single group.
What I want it to look like
Ideally, I would like each class of reference be marked when it is referenced. For instance:
It has recently been discovered that water is wet and the sky is blue[+2], but it is still controversial whether a pound of iron is heavier than a pound of cotton[-3].
Here,  is a reference I have read, [+2] is a reference I haven't read but plan to, and [-3] is a reference I don't want to read. The actual format doesn't matter, so long as it's compatible with major citation styles (numerical and author-year) - it can be stars, daggers, color, kind of bracket, font, a letter, etc. (though simple is better)
Then the bibliography would look like so:
1. Brooks, R. Surprising fluidic characteristics of dihydrogen monoxide. Journal of Fluidic Chemistry 30 (July 2013), 40-52.
+2. Brown, N., Blum, M., Maruyama, E., and Martinez, P. A novel, powerful spectrometric method for evaluating chromaticity. Proceedings of the Royal Astrological Society (May 1999).
-3. Martinez, M., and Morrison, R. T. Which one is heavier: Separating facts from fiction. 17th International Conference of Boring Arguments (Oct. 2012).
Again, the exact symbols don't matter. Alternatively to this scheme, it would also be fine if it could output three separate bibliographies, with each class of reference in its own bibliography.
I would prefer to be able to tell at a glance which references I've read and which ones I haven't both in the text and the bibliography(ies), but if that is hard, then it would suffice if I could by looking at the bibliography only.