The short version: Use "@name" in your templates:
The longer version:
If your assetic configuration looks like this :
[config.yml]
assetic:
assets:
bootstrap_css:
inputs:
- %kernel.root_dir%/../web/components/bootstrap/css/bootstrap.css
- %kernel.root_dir%/../web/components/bootstrap/css/bootstrap-theme.css
jquery_ui_css:
....
Now you can use this in your templates, for example in your base.html.twig
<html><head>
...
{% stylesheets output='compiled/main.css'
"@bootstrap_css"
"@jqueryui_css"
...etc
%}
<link rel="stylesheet" href="{{ asset_url }}" />
{% endstylesheets %}
</head></html
This one also defines that all css that is in there should be concatenated into one main.css file in the compiled directory.