Great Description of Chudes and Sirtja is given in Alexey Komogotsev work "Mysterious Chudes. Who were Chudes metallurgists?". Interesting facts about this amazing dwarf people, supplemented by the author's arguments on the possible existence of Chudes and Diva people nowadays (they are considered together, although the author notes a fundamental difference between Chudes and Diva people) are also given in N. Subbotin work "Chudes and Diva people. The underground civilization of the Ural mountains".
The section "Aboriginal inhabitants"
Read also the works by A.Komogortsev "Mysterious Chudes and Slavic cult of a pangolin-corcodel" and "Return of dwarf people"
Read my works "Underground-terrestrial megalithic complex of Israel", "Who constructed the underground-terrestrial megalithic complex of Israel and when was it constructed?" (translated into English), "Underground and rock cities of Cappadocia (Turkey)" and "Who also when had constructed the underground and rocky cities of Cappadocia (Turkey)?" (translated into English)