[paper] fix reference formatting

TRIQS · Nov 29, 2024 · 7884acf · 7884acf
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diff --git a/paper/paper.md b/paper/paper.md
@@ -62,8 +62,8 @@ Currently, there exist implementations of `CTHYB` within three different librari
 
 However, a simpler and potentially faster version of the `CTHYB` algorithm, 
 called `CTSEG`, can be used under the restriction of density-density
-interactions on the impurity[@werner2006a,@werner2006b,@haule2007]. `CTSEG` can be further generalized to allow for time-dependent[@werner2007,@werner2010] and 
-spin-spin interactions [@otsuki2013,@steiner2015]: see [@werner2016] for a review. To our knowledge, there exists so far one published implementation of `CTSEG` based on ALPS [@ALPS-CTSEG], but it does not allow for spin-spin interactions. 
+interactions on the impurity [@werner2006a;@werner2006b;@haule2007]. `CTSEG` can be further generalized to allow for time-dependent[@werner2007;@werner2010] and 
+spin-spin interactions [@otsuki2013;@steiner2015]: see `@werner2016` for a review. To our knowledge, there exists so far one published implementation of `CTSEG` based on ALPS [@ALPS-CTSEG], but it does not allow for spin-spin interactions. 
 
 Our `CTSEG` solver is about twice as fast as `TRIQS-CTHYB` for a single orbital problem, and has
 better scaling with the number of orbitals (40 times faster in our 5 orbital test case, see Fig. 1a).