Update bibliography database

Author: shorodilov

src/refs.bib

@@ -241,3 +241,13 @@ @manual{linux-grd1-manual
     author = {Tobias Elsner and Anselm Lingnau},
     editor = {Anselm Lingnau},
 }
+
+@misc{busybox,
+    title = {BusyBox - Command Help},
+    url = {https://busybox.net/downloads/BusyBox.html},
+}
+
+@misc{curl,
+    title = {command line tool and library for transferring data with URLs},
+    url = {https://curl.se/},
+}