Add multiple citations

bibliography.bib

@@ -75,7 +75,6 @@
   number      = {UHAM004903},
 }
 
-
 @manual{telematics_industrial_vehicle,
     title = {Utilization analysis methodology for fleet telematics of heavy earthwork equipment},
     journal = {Automation in Construction},
@@ -90,19 +89,15 @@
 @manual{css_electronics_j1939,
   title        = {J1939 data starter pack},
   author       = {{CSS Electronics}},
-  organization = {CSS Electronics},
   year         = {2022},
-  month        = {apr},
-  note         = {Last modified: April 20, 2022},
+  month        = {04},
 }
 
 @manual{css_electronics_can_bus,
   title        = {CAN bus - the ultimate guide},
   author       = {{CSS Electronics}},
-  organization = {CSS Electronics},
   year         = {2022},
-  month        = {apr},
-  note         = {Last modified: April 20, 2022},
+  month        = {04},
 }
 
 @misc{diagnet-komatsu,
@@ -140,6 +135,26 @@
   note      = {Revision: 1396a85(2013-01-07). License: Creative Commons CC BY-NC-SA 3.0}
 }
 
+@manual{bosch1991canspec2,
+  author       = {{Robert Bosch GmbH}},
+  title        = {CAN Specification Version 2.0},
+  year         = {1991},
+  month        = {September},
+  note         = {Document imported into Framemaker by Chuck Powers, Motorola MCTG Multiplex Applications, April 5, 1995},
+  organization = {Robert Bosch GmbH},
+  address      = {Postfach 50, D-7000 Stuttgart 1, Germany},
+  url          = {https://www.bosch-semiconductors.com/ip-modules/can-protocol/},
+  urldate      = {2026-08-09},
+  abstract     = {This document defines the Controller Area Network (CAN) protocol, including both the standard (11-bit identifier) and extended (29-bit identifier) frame formats, as well as error handling, fault confinement, and bit timing requirements.},
+  keywords     = {CAN, Controller Area Network, serial communication, automotive, real-time control, protocol specification},
+}
+
+
+
+
+
+
+
 % datasheet (esiste questo?) per i vari datasheet: stm32f405.... , tja1050 ed eventuali altre cose su pcb
 %                                                   da vedere anche per la presa deutsch
 % also microcontrol j1939 protocol stack (download folder)