TY  - BOOK
AU  - Tyson,Neil deGrasse
AU  - Strauss,Michael Abram
AU  - Gott,J.Richard  Neil deGrasse
TI  - Welcome to the universe: the problem book 
SN  - 9780691177809 (Paperback)
PY  - 2017///
CY  - Princeton
PB  - Princeton university press
KW  - Cosmology
KW  - Problems, exercises, etc
ER  -