https://brueckenbau.wordpress.com/2016/02/14/philosophie/

http://www.philosophie.at/sinnsuche.htm

https://welt3bild.wordpress.com/2015/04/21/philosophieren/

https://welt3bild.wordpress.com/2017/10/02/leibniz-quantentheorie-psychologie-und-ganzheitsmedizin/