[1]
E. . Yousefi, “A MIXED PROBLEM FOR THE FOURTH ORDER DEGENERATE ORDINARY DIFFERENTIAL EQUATION”, Proc. YSU A: Phys. Math. Sci., vol. 44, no. 2 (222), pp. 16–19, Apr. 2010, doi: 10.46991/PYSUA.2010.44.2.016.