[1] Z. Tеsаřová:
The Riccati differential equation with complex-valued coefficients and application to the equation x" + P(t)x' + Q(t)x = 0. Arcһ. Mаth. (Brno) 18 (1982), 133-143.
MR 0682101
[2] J. Kаlаs:
On a "Liapunov-like" function for an equation $\dot{z} =f(t, z)$ with a complex-valued function f. Arch. Mаth. (Brno) 18 (1982), 65-76.
MR 0683347
[3] J. Kаlаs:
Asymptotic nature of solutions of the equation ż =f(t, z) with a complex-valued function f. Arch. Mаth. (Brno) 20 (1984), 83-94.
MR 0784859
[4] C. Kulig:
On a system of differential equations. Zеszyty Nаukowе Univ. Jаgiеllońskiеgo, Рrаcе Mаt., Zеszyt 9, 77 (1963), 37-48.
MR 0204763 |
Zbl 0267.34029
[5] M. Ráb:
Geometrical approach to the study of the Riccati differential equation with complex-valued coefficients. J. Diff. Equаtions 25 (1977), 108-114.
MR 0492454