[1] J. Aczél:
Lectures on Functional Equations and their Applications. Acad. Press, New Yoгк 1966.
MR 0208210
[2] F. M. Arscott:
Periodic Differential Equations. Pergamon Press, Oxford 1964.
Zbl 0121.29903
[3] O. Borůvka:
Linear Differential Transformations of the Second Order. The English Univ. Press, London 1971.
MR 0463539
[4] O. Borůvka:
Sur les blocs des équations différentielles Y" = Q(T) Y aux coefficients périodique. Rend. Mat. 8 (1975), 519-532.
MR 0379945
[5] O. Borůvka: Teopuя глoбaныx cвoйcmв oбыкнoвeнныx лuнeйныx дuффepeнцuaльныx ypaвнeнuй вmopoгo nopядкa. Диффepeнциaльныe ypaвнeния 8 (1976), 1347-1383.
[7] W. Magnus & S. Winкler: Hill's Equation. Interѕcience Publiѕherѕ, New Yorк 1966.
[8] F. Neuman:
Note on bounded non-periodic solutions of second-order linear differential equations with periodic coefficients. Math. Nachr. 39 (1969), 217-222.
MR 0247193 |
Zbl 0169.41703