Update earth_spheres.md

ec-jrc · Sep 11, 2024 · c9c2b0f · c9c2b0f
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@@ -19,6 +19,6 @@ Spheres dividing planet Earth into subsystems, which are collectives of (physica
 - Anthroposhere
 
 ### Sources
-- Hugget, R. et al, 2024, DOI: 10.1177/03091333241275465
-- Guth, P, et al, 2021, https://doi.org/10.3390/rs13183581
-- Martin, Y.E, et al 2012
+- Hugget, R., et al, 2024, DOI: 10.1177/03091333241275465
+- Guth, P., et al, 2021, https://doi.org/10.3390/rs13183581
+- Martin, Y.E, et al, 2012