1. Arlin, K.: About functor category and enough injectives. Mathematics Stack Exchange. https://math.stackexchange.com/q/2460009 (version: 2017-10-06)
2. Bär, C., Becker, C.: Differential Characters and Geometric Chains, pp. 1–90. Springer International Publishing, Cham (2014). https://doi.org/10.1007/978-3-319-07034-6_1
3. Brylinski, J.L.: Loop Spaces, Characteristic Classes and Geometric Quantization, Modern Birkhäuser Classics, vol. 107. Birkhäuser, Basel (1993). https://doi.org/10.1007/978-0-8176-4731-5
4. Bunke, U., Kreck, M., Schick, T.: A geometric description of differential cohomology. Ann. Math. Blaise Pascal 17(1), 1–16 (2010). https://doi.org/10.5802/ambp.276
5. Bunke, U., Schick, T.: Smooth $$k$$-theory. In: Xianzhe, D., Rémi, L., Ma, X., Weiping, Z. (eds.): From probability to geometry (II)—volume in honor of the 60th birthday of Jean-Michel Bismut, no. 328 in Astérisque, pp. 45–135. Société Mathématique de France (2009). http://www.numdam.org/item/AST_2009__328__45_0