The Hated
Frederik Pohl
Pythias
The Day of the Boomer Dukes
Beyond the Blue Event Horizon (Heechee Saga)
Gateway
The Far Shore of Time
The age of the pussyfoot
Homegoing
The World at the End of Time
Heechee rendezvous: a novel
Beyond the blue event horizon
Heechee Rendezvous
Day Million
Star of stars