Pollack, James B.; Grossman, Allen S.; Moore, Ronald; Graboske, Harold C. Jr. (1977). «A Calculation of Saturn's Gravitational Contraction History». Icarus (Academic Press, Inc) 30 (1): 111–128. Bibcode:1977Icar...30..111P. doi:10.1016/0019-1035(77)90126-9.
Pollack, James B.; Grossman, Allen S.; Moore, Ronald; Graboske, Harold C. Jr. (1977). «A Calculation of Saturn's Gravitational Contraction History». Icarus (Academic Press, Inc) 30 (1): 111–128. Bibcode:1977Icar...30..111P. doi:10.1016/0019-1035(77)90126-9.