Add 2022 article from Electronics journal.

references.bib

@@ -1,3 +1,14 @@
+@article{Cheng2022a,
+	author = {Yanan Cheng and Yali Liu and Chao Li and Zhaoxin Zhang and Ning Li and Yuejin Du},
+	title = {In-Depth Evaluation of the Impact of National-Level {DNS} Filtering on {DNS} Resolvers over Space and Time},
+	journal = {Electronics},
+	volume = {11},
+	number = {8},
+	publisher = {MDPI},
+	year = {2022},
+	url = {https://www.mdpi.com/2079-9292/11/8/1276/pdf},
+}
+
 @inproceedings{Zillien2024a,
 	author = {Sebastian Zillien and Tobias Schmidbauer and Mario Kubek and Jörg Keller and Steffen Wendzel},
 	title = {Look What's There! Utilizing the {Internet}'s Existing Data for Censorship Circumvention with {OPPRESSION}},