The present state of observation and theory seems to offer no short

1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z
1934MNRAS..95...84Z