N. Ackermann, Long-time dynamics in semilinear
parabolic problems with autocatalysis, Recent progress
on reaction-diffusion systems and viscosity solutions
(Y. Du, H. Ishii, and W.Y. Lin, eds.), World Sci.
Publ., Hackensack, NJ, 2009, pp. 1-30. [ .html ]
N. Ackermann, Solution set splitting at low
energy levels in Schrödinger equations with periodic
and symmetric potential, J. Differential Equations
246 (2009), no. 4, 1470-1499.
[ DOI ]
N. Ackermann, T. Bartsch,
P. Kaplický, and P. Quittner, A priori
bounds, nodal equilibria and connecting orbits in
indefinite superlinear parabolic problems, Trans.
Amer. Math. Soc. 360 (2008), no. 7,
3493-3539. [ DOI |
.pdf ]
N. Ackermann, T. Bartsch, and
P. Kaplický, An invariant set generated by
the domain topology for parabolic semiflows with small
diffusion, Discrete Contin. Dyn. Syst.
18 (2007), no. 4, 613-626.
[ http |
.pdf ]
N. Ackermann, A nonlinear superposition
principle and multibump solutions of periodic
Schrödinger equations, J. Funct. Anal.
234 (2006), no. 2, 277-320.
[ DOI ]
N. Ackermann, An abstract approach to
multibump solutions of periodic Schrödinger equations
and applications, Nonlin. Anal. 63
(2005), e1031-e1037. [ DOI ]
N. Ackermann and T. Bartsch, Superstable
manifolds of semilinear parabolic problems, J.
Dynam. Differential Equations 17
(2005), no. 1, 115-173. [ .pdf ]
N. Ackermann and T. Weth, Multibump
solutions of nonlinear periodic Schrödinger equations
in a degenerate setting, Commun. Contemp. Math.
7 (2005), no. 3, 269-298.
[ DOI ]
N. Ackermann, A Cauchy-Schwarz type inequality
for bilinear integrals on positive measures, Proc.
Amer. Math. Soc. 133 (2005), no. 9,
2647-2656 (electronic). [ DOI |
.pdf ]
N. Ackermann, On the multiplicity of sign
changing solutions to nonlinear periodic Schrödinger
equations, Topological methods, variational methods
and their applications (Taiyuan, 2002), World Sci.
Publishing, River Edge, NJ, 2003, pp. 1-9.
[ .html ]
N. Ackermann, Lokalisierung der
niederenergetischen Lösungen eines singulär
gestörten elliptischen Neumann-Problems mittels der
Geometrie des Gebietsrandes, Ph.D. thesis,
Universität Giessen, Germany, 1999. [ http ]
N. Ackermann, Multiple single-peaked solutions
of a class of semilinear Neumann problems via the category
of the domain boundary, Calc. Var. Partial
Differential Equations 7 (1998),
no. 3, 263-292. [ DOI ]