1. Akishev, G.: On the imbedding of certain classes of functions of several variables in the Lorentz space. Izvestya AN KazSSR, ser. fiz.-mat. 3, 47–51 (1982)
2. Akishev, G.A.: On degrees of approximation of some classes by polynomials with respect to generalized Haar system. Sib. Electron. Math. Rep. 3, 92–105 (2006)
3. Akishev, G.: On the orders $$M$$-terms approximations of classes of functions of the symmetrical space. Mat. Zh. 14(4), 44–71 (2014)
4. Akishev, G.: Estimates for best approximations of functions from the logarthmic smoothness class in the Lorentz space. Trudy Instituta Matematiki i Mekhaniki UrO RAN. 23(3), 3–21 (2017)
5. Akishev, G.: An inequality of different metrics in the generalized Lorentz space. Trudy Instituta Matematiki i Mekhaniki UrO RAN 24(4), 5–18 (2018)