Using a different reference for SOFA per @timj's recommendation

P95.bib

@@ -72,17 +72,15 @@ @BOOK{oliphant2006guide
   publisher={Trelgol Publishing USA}
 }
 
-@ARTICLE{sofa_wallace,
- author = {{Wallace}, P.~T.},
- title = "{Software for timescale applications}",
- journal = {Metrologia},
- year = 2011,
- month = aug,
- volume = 48,
- pages = {200},
- doi = {10.1088/0026-1394/48/4/S11},
- adsurl = {http://adsabs.harvard.edu/abs/2011Metro..48S.200W},
- adsnote = {Provided by the SAO/NASA Astrophysics Data System}
+@ARTICLE{Hohenkerk:2010,
+  author={Hohenkerk, C. },
+  title= {Standards of Fundamental Astronomy},
+  year= 2010,
+  journal={Scholarpedia},
+  volume=5,
+  number=12,
+  pages=11404,
+  note={{doi:10.4249/scholarpedia.11404}},
 }
 
 @MANUAL{oschenbein2009votable,

P95.tex

@@ -79,7 +79,7 @@ \subsection{Core Data Structures and Transformations}
 Provides functionality for manipulating times and dates.  Specific emphasis is
 placed on supporting time scales (e.g.~UTC, TAI, UT1) and time representations
 (e.g.~JD, MJD, ISO 8601) that are used in astronomy.  Wraps the ERFA library of
-time and calendar routines, which is a fork of SOFA \citep{sofa_wallace}
+time and calendar routines, which is a fork of SOFA \citep{Hohenkerk:2010}
 released under a more permissive license.
 
 \altsubsubsection*{\texttt{astropy.coordinates}}