Mathematical olympiad series-problem of number theory in mathematical competition vol II by Yu Hong-Bing pdf
https://drive.google.com/file/d/1InVFATRnC0eKNd_1wFN4jvfv_nqEONiT/view?usp=drivesdk
Methods of solving sequence and series problem by Ellina Grigorieva pdf
https://drive.google.com/file/d/1JYUqqof9Gm1mM3II3JaE1puhpQ2Eyzti/view?usp=drivesdk
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