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