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![Cover for Ellina Grigorieva · Methods of Solving Number Theory Problems (Hardcover Book) [1st ed. 2018 edition] (2018)](https://imusic.b-cdn.net/images/item/original/141/9783319909141.jpg?ellina-grigorieva-2018-methods-of-solving-number-theory-problems-hardcover-book&class=scaled&v=1584199284)
![Cover for Ellina Grigorieva · Methods of Solving Sequence and Series Problems (Hardcover Book) [1st ed. 2016 edition] (2016)](https://imusic.b-cdn.net/images/item/original/850/9783319456850.jpg?ellina-grigorieva-2016-methods-of-solving-sequence-and-series-problems-hardcover-book&class=scaled&v=1483710495)
![Cover for Ellina Grigorieva · Methods of Solving Nonstandard Problems (Hardcover Book) [1st ed. 2015 edition] (2015)](https://imusic.b-cdn.net/images/item/original/866/9783319198866.jpg?ellina-grigorieva-2015-methods-of-solving-nonstandard-problems-hardcover-book&class=scaled&v=1563992853)