%28PDF%29%20The%20enduring%20challenge%20of%20%u2018wicked%20problems%u2019%3A%20revisiting%20Rittel%20and%20Webber
%28PDF%29%20The%20enduring%20challenge%20of%20%u2018wicked%20problems%u2019%3A%20revisiting%20Rittel%20and%20Webber: Dilemmas in a general theory of planning