Include scripts and stylesheet links into <head> section

Hello, how do you insert content into the <head> section?. Lets see:

onApplicationInit(): This event is triggered in the <body> section. [fail]
onScriptInit(): This event is triggered outside of <html> section [fail]
onHeader(): Triggered while rendering application’ headers. [fail]

Possible solutions that I want to avoid:

  1. Using jQuery to append dynamically content inside of <head> using an event.
  2. Create a new html layout.

Thank you in advance.

Hello… just following up this case.