
http://ukandeu.ac.uk/wp-content/uploads/2018/10/The-mechanics-of-a-further-referendum-on-Brexit-Constitution-Unit-Report-1.pdf

https://theconversation.com/han-finalizado-el-proces-y-el-movimiento-independentista-en-cataluna-231631

https://publiclawforeveryone.com/2017/06/10/does-the-salisbury-convention-apply-during-a-hung-parliament/