"Null-A continuum : continuing A.E. van Vogt's The world of null-A" . . . . "Science fiction" . "Science fiction"@en . "Null-A continuum" . "Null-A continuum"@en . . . . . "Null - A continuum"@en . . . . . "A sequel to A.E. van Vogt's classic \"The World of Null-A\" finds Gilbert Gosseyn discovering a third brain that enables his travels to unimaginable distances in space and time, where he is challenged to prevent the extermination of the human race." . . . "Fiction" . "Fiction"@en . . . . . . . .