data mostly contradict the traditional view that education was a leading source of the seismic social phenomenon of … fixed effects account for time-invariant unobserved heterogeneity, education – but not income or urbanization – is …

, enabled e-mail-based knowledge exchange and collaboration among academics. After the adoption of BITNET, university …

, enabled e-mail-based knowledge exchange and collaboration among academics. After the adoption of BITNET, university …