public function createStylesheetPaths(array $stylesheets)
    {
        $sheets = array();

        foreach ($stylesheets as $key => $sheet) {
            if (!$this->isExternalStylesheet($sheet)) {
                // assetic version removal
                $sheet = str_replace(strrchr($sheet, 'css?'), 'css', $sheet);
                $sheet = $this->getBasePath() . $sheet;
            }

            $sheets[] = $sheet;
        }

        return $sheets;
    }