I have been trying to cite different publication types using different labels for each. For instance, having the following bib file  \begin{filecontents}{references.bib}  @article{Anonymous:2013, Author = {Anonymous, Arthur}, Journal = {Somewhere}, Pages = {46-54}, Title = {Arthur's article}, Volume = {25 (2013)}, Year = {2013}, sorttitle = {b}}  @article{Anonymous:2012c,  Author = {Anonymous, Arthur}, Journal = {Somewhere else}, Pages = {6-12}, Title = {Last words}, Volume = {43 (2012)}, Year = {2012}, sorttitle = {c}}  @book{Anonymous:2012a, Address = {Someplace}, Author = {Anonymous, Arthur}, Publisher = {Nobody}, Title = {Book by Arthur}, Year = {2012}, sorttitle = {a}}  \end{filecontents}  \bibliography{references.bib}   How can I produce a citation list with biblatex as follows:  Books  [B1] A. Anonymous, Book by Arthur, bla bla  Articles  [J2] A. Anonymous, Arthur's article, Somewhere, 2013, bla bla  [J1] A. Anonymous, Last words, Somewhere else, 2012, bla bla
I would like to have a similar biblatex behaviour as described , i.e. separate bibliographies for different publication types, each bibliography should 1) be prefixed with a corresponding label (C for conference publications, J for journals etc), 2) sorted so that the newest entry is at the top (defined by the publication year) and 3) with reference numbers sorted in descending order per bibliography, i.e. the newest entry should have the highest number.  Journal articles ---------------- [J3]    reference from 2017 [J2]    reference from 2016 [J1]    reference from 2015  Conference publications ----------------------- [C4]    reference from 2017 [C3]    reference from 2017 [C2]    reference from 2016 [C1]    reference from 2015   I currently have the following:  \usepackage[backend=biber,         isbn=true,         giveninits=true,         style=numeric,         maxnames=99,         sorting=ydnt,         defernumbers=true,         autocite=superscript]{biblatex}  \subsection*{Journal articles} \begin{refcontext}[labelprefix=J] \printbibliography[type=article] \end{refcontext}  \subsection*{Conference publications} \begin{refcontext}[labelprefix=C] \printbibliography[type=inproceedings]   Separate bibliographies works fine, labelprefix also works as desired, sorting by year in descending order as well. However, if I try the solution mentioned in the above question I get very high reference numbers (in the 500s).  Is the above behaviour possible at all and, if yes, what is the most elegant solution using current biblatex etc.?  Thanks a lot in advance!
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