1110.0545 (Stephen R. Green et al.)

Constraints on String Cosmology    [PDF]

Stephen R. Green, Emil J. Martinec, Callum Quigley, Savdeep Sethi

1201.4056 (Artyom V. Astashenok et al.)

Phantom Cosmology without Big Rip Singularity    [PDF]

Artyom V. Astashenok, Shin'ichi Nojiri, Sergei D. Odintsov, Artyom V. Yurov