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diff --git a/physics.bib b/physics.bib
index 5adb7da..5d2150d 100755
--- a/physics.bib
+++ b/physics.bib
@@ -327,3 +327,24 @@
   year   = {1994},
   url    = {http://kea.princeton.edu/papers/varenna94},
 }
+
+@misc{gratus2017pictorial,
+  title         = {A pictorial introduction to differential geometry, leading to Maxwell's equations as three pictures},
+  author        = {Jonathan Gratus},
+  year          = {2017},
+  eprint        = {1709.08492},
+  archivePrefix = {arXiv},
+  primaryClass  = {math.DG},
+  url           = {https://arxiv.org/abs/1709.08492},
+}
+
+@book{batterman2001,
+  title     = {The Devil in the Details: Asymptotic Reasoning in Explanation, Reduction, and Emergence},
+  author    = {Robert W. Batterman},
+  publisher = {Oxford University Press, USA},
+  isbn      = {0195146476,9780195146479},
+  year      = {2001},
+  series    = {Oxford Studies in Philosophy of Science},
+  edition   = {},
+  volume    = {},
+}