Journal of Mathematical Sciences: Advances and Applications
[1] R. P. Agarwal, A note on Grace and Lalli’s paper, J. Math. Anal.
Appl. 86 (1982), 471-475.
[2] D. E. Edmunds and W. D. Evans, Spectral Theory and Differential
Operators, Oxford University Press, 1987.
[3] W. N. Everitt, The number of integrable-square solutions of
products of differential expressions, Proc. of the Royal Soc. of
Edinburgh 76A (1977), 215-226.
[4] W. N. Everitt and D. Race, Some remarks on linear ordinary
quasi-differential expressions, Proc. London Math. Soc. 54(3) (1987),
300-320.
[5] H. Frentzen, Quasi-differential operators in 
spaces, Bulletin London Mathematical Soc.
31(3) (1999).
[6] S. R. Grace and B. S. Lalli, Asymptotic behavior of certain second
order integro- differential equations, J. Math. Anal. 76 (1980),
84-90.
[7] S. E. Ibrahim, Boundedness for solutions of general ordinary
quasi-differential equations, Journal of the Egyptian Mathematical
Society 2 (1994), 33-44.
[8] S. E. Ibrahim, On 
derivatives for solutions of perturbed
general quasi- differential equations, Czech. Math. J. 49(124) (1999),
Praha, 877-890.
[9] S. E. Ibrahim, On the boundedness of solutions for products of
quasi-integro differential equations, IJMMS 16(10) (2003), 639-659.
[10] S. E. Ibrahim, On the boundary conditions for products of general
quasi-differential operators in direct sum spaces, IJAM 22(1) (2009),
55-87.
[11] S. E. Ibrahim, On the product of self-adjoint Sturm-Liouville
differential operators in direct sum spaces, J. of Informatics and
Mathematical Sciences 1 (2012), 93-109.
[12] S. E. Ibrahim, The regularly solvable operators in spaces, Fundamental Journal of
Mathematics and Mathematical Sciences 2(1) (2015), 1-28.
[13] B. S. Lalli, On boundedness of solutions of certain second-order
differential equations, J. of Mathematical Analysis and Applications
25 (1969), 182-188.
[14] J. S. W. Wong, Square integrable solutions of perturbed linear
differential equations, Proc. Royal Soc. of Edinburgh 73A (1974/75),
251-254.
[15] E. H. Yang, On asymptotic behavior of certain second order
integro-differential equations, Proc. Amer. Math. Soc. 90 (1984),
271-276.
[16] E. H. Yang, Asymptotic behavior of certain second order
integro-differential equations, J. Math. Anal. Appl. 106 (1985),
132-139.
[17] A. Zettl, Square integrable solutions of 
Proc. Amer. Math. Soc. 26 (1970),
635-639.
[18] A. Zettl, Perturbation of the limit circle case, Quart. J. Math.
Oxford 26(3) (1975), 355-360.
[19] A. Zettl, The limit point and limit circle cases for polynomials
in differential expressions, Proc. Royal Soc. of Edinburgh 72A (1975),
219-224.
[20] A. Zettl, Formally self-adjoint quasi-differential operators,
Rocky Mountain Journal of Mathematics 5 (1975), 453-474.
