“Number theory through exercises”, (2019), USA (260 pages, in english). Buy this book online

Sedrakyan Hayk, Sedrakyan Nairi, “The Stair-Step Approach in Mathematics”, (2018), Springer, USA (550 pages, in english). Buy this book online  

Sedrakyan Hayk, Sedrakyan Nairi, “Algebraic Inequalities”, (2018), Springer, USA (256 pages, in english). Buy this book online

Sedrakyan H.N., Sedrakyan N.M., “Geometric Inequalities. Methods of proving”, (2017), Springer, USA (464 pages, in english). Buy this book online