Entrenched clause (English Wikipedia)

UNDP and International IDEA, ed. (26 January 2014). "The Constitution of the Tunisian Republic" (PDF). Constitution.net. Article 75. Archived from the original (PDF) on 23 September 2015. Retrieved 17 July 2019.

corporate-cases.com

Elkind, Jerome B. (1987). "A New Look at Entrenchment". The Modern Law Review. 50 (2): 158–175. doi:10.1111/j.1468-2230.1987.tb02570.x. ISSN 0026-7961. JSTOR 1096137.
Blick, Andrew (January 2016). "Constitutional Implications of the Fixed-Term Parliaments Act 2011". Parliamentary Affairs. 69 (1): 19–35. doi:10.1093/pa/gsv004. The UK has no written constitution. Yet entrenchment in some forms has had a part in UK constitutional conceptions. Moreover, in recent times this role has grown. Some precedent for supermajorities, for instance, has appeared through the provision in section 2 of the Fixed-term Parliaments Act 2011 for early general elections, requiring support from two-thirds or more of MPs.

The official English language translation of the Greek Constitution as of May 27, 2008, Article 110 §1, p. 124, source: Hellenic Parliament, "The provisions of the Constitution shall be subject to revision with the exception of those which determine the form of government as a Parliamentary Republic and those of articles 2 paragraph 1, 4 paragraphs 1, 4 and 7 , 5 paragraphs 1 and 3, 13 paragraph 1, and 26."
"Constitution of Greece in English" (PDF). Hellenic Parliament.
"The Constitution of Greece (2008)" (PDF). Hellenic Parliament. Retrieved 17 December 2020.

"Changes like Brexit need a super-majority". Times of India Blog. 2016-07-03. Retrieved 2020-08-31.

"Chapter XIV: Revision of the Constitution". The Constitution of Islamic Republic of Iran. Iran Chamber Society. Retrieved 7 July 2020.

Speech by the Hon. David Jull, MP – Minister for Administrative Services 2001 [1] Archived 2014-02-04 at the Wayback Machine

UNDP and International IDEA, ed. (26 January 2014). "The Constitution of the Tunisian Republic" (PDF). Constitution.net. Article 75. Archived from the original (PDF) on 23 September 2015. Retrieved 17 July 2019.
Gibson, Alan (2006-11-09). "It Is Broken, but No One Wants to Fix It: A Call for Reform of the United States Constitution". Chico State Inside. Archived from the original on 2007-12-01. Retrieved 2021-01-21.
Speech by the Hon. David Jull, MP – Minister for Administrative Services 2001 [1] Archived 2014-02-04 at the Wayback Machine
"Chapter 2 The Basis of Parliamentary Procedure - New Zealand Parliament". www.parliament.nz. Archived from the original on 2019-05-06. Retrieved 2019-05-20.
"The Euro Crisis: Challenges to the ESM Treaty and the Fiscal Compact Treaty before the German Constitutional Court". Institute of International and European Affairs. 30 August 2012. Archived from the original on 17 June 2017. Retrieved 26 August 2019.

Elkind, Jerome B. (1987). "A New Look at Entrenchment". The Modern Law Review. 50 (2): 158–175. doi:10.1111/j.1468-2230.1987.tb02570.x. ISSN 0026-7961. JSTOR 1096137.
Young, Alison L. (2006). "Hunting Sovereignty: Jackson v Her Majesty's Attorney-General". Public Law. 2006 (2). Sweet & Maxwell: 187–196. ISSN 0033-3565.