In Russian. Pershin, Anatoly Ivanovich. Compilation of competitive tasks in mathematics. Saratov: Publishing House of Saratov, 1973. Sbornik konkursnykh zadach po matematike. In Russian/Compendium of Mathematics Tasks. All images are for identification of editions only. Several books of the same edition may be available. Please feel free to request photos of available books. SKU7322122
In Russian. Pershin, Anatoly Ivanovich. Basics of linear programming. Saratov: Publishing House of Saratov, 1973. All images are for identification of editions only. Several books of the same edition may be available. Please feel free to request photos of available books. SKU7322121