Conflict between idealism and materialism https://marxistleninists.org/Reading%20Guide/Marxist%20Philosophy/Conflict%20between%20idealism%20and%20materialism.htm
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Law of unity and conflict of opposites https://marxistleninists.org/Reading%20Guide/Marxist%20Philosophy/Law%20of%20unity%20and%20conflict%20of%20opposites.htm
Archive_rosa_luxemburg-karl_liebknecht http://ciml.250x.com/archive/luxemburg-liebknecht/english/rosa_luxemburg_letters_from_the_prison_1918_english.html