1. M. Artin, J. J. Zhang.Noncommutative projective schemes, Adv. Math., 109 (1994), 228-287.
2. D. Baer, W. Geigle, H. Lenzing.The preprojective algebra of a tame hereditary Artin algebra, Comm. Algebra, 15 (1987), 425-457.
3. A. Beilinson, V. Ginzburg, W. Soergel.Koszul duality patterns in Representation theory, J. Amer. Math. Soc., 9 (1996), 473-527.
4. I. N. Bernšte$\mathop {\rm{i}}\limits^ \vee $n, I. M. Gel'fand, S. I. Gel'fand.Algebraic vector bundles on P$^{n}$ and problems of linear algebras, Funktsional. Anal. i Prilozhen., 12 (1978), 66-67.
5. A. A. Be$\mathop {\rm{i}}\limits^ \vee $linson.Coherent sheaves on P$^{n}$ and problems of linear algebra, Funktsional. Anal. i Prilozhen., 12 (1978), 68-69.