S. I. Chelkak, “Weak regularity of solutions of second-order elliptic quasilinear systems”, Izv. Vyssh. Uchebn. Zaved. Mat., 1989, no. 11, 74–84; Soviet Math. (Iz. VUZ), 33:11 (1989), 88–99
1986
2.
S. I. Chelkak, “Exact conditions for the regularity of generalized solutions of fourth-order quasilinear elliptic systems”, Izv. Vyssh. Uchebn. Zaved. Mat., 1986, no. 12, 55–61; Soviet Math. (Iz. VUZ), 30:12 (1986), 73–81
3.
S. I. Chelkak, “Differentiability of solutions of second-order quasilinear elliptic systems”, Izv. Vyssh. Uchebn. Zaved. Mat., 1986, no. 4, 56–62; Soviet Math. (Iz. VUZ), 30:4 (1986), 73–80
1984
4.
S. I. Chelkak, “Exact conditions for regularity of generalized solutions of
fourth-order quasilinear elliptic systems”, Dokl. Akad. Nauk SSSR, 279:4 (1984), 820–824
5.
S. I. Chelkak, “Regularity of solutions of quasilinear elliptic systems of higher order”, Izv. Vyssh. Uchebn. Zaved. Mat., 1984, no. 1, 33–41; Soviet Math. (Iz. VUZ), 28:1 (1984), 38–47
1983
6.
A. I. Koshelev, S. I. Chelkak, “Regularity of solutions of elliptic systems of higher orders”, Dokl. Akad. Nauk SSSR, 272:2 (1983), 297–300
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