# Modular document with many bibliographies: unique identifier for each chapter?

I've searched this stackexchange and the wider world wide web for an answer to this question to no avail, so I thought I'd try my luck asking. Basically, I would like a unique identifier for each chapters bibliography. Explanation below.

Like many other questions that have been asked, I am compiling a PhD thesis as a modular document and each chapter has its own bibliography.

\documentclass[12pt, a4paper, oneside]{Thesis}
\usepackage[sectionbib, square, numbers, comma, sort&compress]{natbib}
\begin{document}
<<Title page, acknowledgements etc>>

\include{Chapters/Introduction}
\include{Chapters/Chapter1}
\include{Chapters/Chapter2}
\include{Chapters/Conclusions}

\end{document}

Thats the main file, and each chapter/conclusions/intro etc has the format:

\chapter{Chapter title}

Text

\label{Bibliography}
\bibliographystyle{ieeetr}
\bibliography{bibtexfile.bib}

And the bibtexfiles are just usual .bib files with @articles @books @misc etc, all of these are ripped off journal websites.

As it stands, every single chapter has it's own Bibliography section and these are numbered 1-Whatever in the correct order which I love. I was told in my PhD defence to either compile one massive bibliography at the end of the thesis (which I hate) OR keep the individual chapter bibs but have each of them a unique identifier. The example chosen was that if I open a page and see reference number 33, which bibliography should I go to for ref 33?

Is there a way to have each bibliography list the references with a chapter-specific identifier. For example, chapter 3 references 20 might be listed as [3-20] in the text? Or something similar..

any help is appreciated, I included what I believe to be all the relevant code but if anything is unclear please let me know.

Thanks