update openmp reference

joss-paper/paper.md

@@ -217,7 +217,7 @@ knowledge to compute them as performantly as possible.
 
 Accelerators present new challenges to standard object-oriented
 programming. In particular, not all compiler stacks (such as Sycl
-[@SYCL] or OpenMP Target Offload [@chandra2001parallel])
+[@SYCL] or OpenMP [@chandra2001parallel] Target Offload [@openmp4])
 support relocatable device code, which is required for standard C++
 polymorphism. Even in programming models, such as CUDA [@cuda],
 which do support relocatable device code, polymorphism can be slower

joss-paper/refs.bib

@@ -126,6 +126,14 @@ @book{chandra2001parallel
   publisher={Morgan kaufmann}
 } 
 
+@misc{openmp4,
+    author = {{OpenMP Architecture Review Board}},
+    title = {{OpenMP} Application Program Interface Version 4.0},
+    month = {July},
+    year = {2013},
+    url = {https://www.openmp.org/wp-content/uploads/OpenMP4.0.0.pdf}
+}
+
 @inproceedings{SYCL,
 author = {Reyes, Ruyman and Brown, Gordon and Burns, Rod and Wong, Michael},
 title = {SYCL 2020: More than Meets the Eye},