https://www.nemcina-zdarma.cz/article/2019050201-stupnovani-pridavnych-jmen-a-prislovci
http://www.nemecky.net/testy/doplnovani-slov-i/stupnovani-pridavnych-jmen-i-317/
https://nemcina.net/cviceni/pridavna-jmena/stupnovani2/