Hello Nico, and welcome to the Monastery!

Here are some references to aid in your research:

The official docs:

• perlintro#Safety-net
• strict vars in strict
• my in index-functions
• “What’s the difference between dynamic and lexical (static) scoping? Between local() and my()?” in perlfaq7
• “Scoped Declarations” in Chapter 4 of the Camel Book

Monastic wisdom:

• Use strict and warnings by runrig
• 101 reasons to use strict; by George_Sherston
• Re: Why you should use strict by davido
• Use strict warnings and diagnostics and Use strict warnings and diagnostics or die by tachyon
• The strictures, according to Seuss by toolic
• Update: Re: lexical variable by moritz — see the references on scoping

Hope that helps,