master.bib line spacing between entries

progress/master.bib

@@ -6,11 +6,13 @@
   title =        {PDFLaTeX Instructions},
   url =          {http://www.ecs.soton.ac.uk/~srg/softwaretools/document/}
 }
+
 @article{CSCRM,
   author =      {Boyson, Sandor},
   title =       {Cyber supply chain risk management: Revolutionizing the strategic control of critical IT systems},
   url =         {https://www.sciencedirect.com/science/article/pii/S0166497214000194}
 }
+
 @incollection{ComplianceGovernance,
   author =      {Silveira et al.},
   title =       {Aiding Compliance Governance in Service-Based Business Processes},
@@ -19,17 +21,20 @@
   booktitle =   {Handbook of Research on Service-Oriented Systems and Non-Functional Properties: Future Directions},
   url =         {https://www.igi-global.com/chapter/handbook-research-service-oriented-systems/60900}
 }
+
 @document{CombattingCyberRisks,
   author =      {Shackleford, Dave},
   publisher =   {SANS Whitepaper},
   year =        {2015},
   url =         {https://www.raytheon.com/sites/default/files/capabilities/rtnwcm/groups/cyber/documents/content/rtn_273005.pdf}
 }
+
 @misc{CyberCrime,
   author =      {National Crime Agency},
   title =       {Cyber Crime},
   url =         {https://www.nationalcrimeagency.gov.uk/what-we-do/crime-threats/cyber-crime}
 }
+
 @misc{CyberEssentials,
   author =      {GOV.UK},
   title =       {Cyber Essentials Scheme: Overview},