Update P-3 page to use citations

how_to_eurec4a/p3_AXBTs.md

@@ -18,7 +18,8 @@ to measure profiles of ocean temperature. (These are kind of the oceanic equival
 dropsondes but they don't measure salinity.) Often these were dropped around
 other ocean temperature measurements - for example the autonomous
 Surface Wave Instrument Floats with Tracking (SWIFT) buoys deployed from the
-Ron Brown by Elizabeth Thompson of NOAA and her colleagues.
+Ron Brown by Elizabeth Thompson of NOAA and her colleagues. The SWIFT deployment
+is described in {cite}`Quinn:2021`.
 
 Let's take a look at some of the AXBT measurements and how they compare to the
 SWIFTs.

how_to_eurec4a/pthree.md

@@ -17,8 +17,7 @@ of clouds and the ocean surface, _in situ_ measurements within clouds and of
 isotopic composition throughout the lower troposphere, and the deployment of
 expendable profiling instruments in the atmosphere and ocean.
 
-Most observations obtained from the P-3 are described in
-[Pincus et al. (2021)](https://doi.org/10.5194/essd-2021-11).
+Most observations obtained from the P-3 are described in {cite}`Pincus:2021`.
 
 ```{figure} Miss-Piggy.jpeg
 :alt: NOAA WP-3D "Miss Piggy"