diff --git a/constants/50a.md b/constants/50a.md
index 431c9ce..5b392b2 100644
--- a/constants/50a.md
+++ b/constants/50a.md
@@ -18,7 +18,7 @@ $$C_{50} = \sup_f \min_G
 
 | Bound | Reference | Comments |
 | ----- | --------- | -------- |
-| $< 1$ | [PG25] | There exists $\alpha<1$, such that it is NP-hard to compute a value approximating QMC to within approximation ratio $\alpha$. |
+| $< 1$ | [P25] | There exists $\alpha<1$, such that it is NP-hard to compute a value approximating QMC to within approximation ratio $\alpha$. |
 | 0.5   | [GP19]    | best possible product state approximation
 
 
diff --git a/constants/52a.md b/constants/52a.md
index d425c23..43bd767 100644
--- a/constants/52a.md
+++ b/constants/52a.md
@@ -49,7 +49,7 @@ $\liminf_{n \to \infty} r_{3,n}$.
 |1.63| [BFU1993] ||
 |3.003| [FS1996]||
 |3.145|[A2000]||
-|3.26|[AS2000]||
+|3.26|[AC2000]||
 |3.42 | [KKL2002]||
 | 3.52| [HS2003], [KKL2003]||