p. 19: Change to

The **mobility**
of the
electron is defined as the ratio of the product of the electron
charge and the average time between collisions
to the mass of
the electron
[Fey10A]:

m = qt / m_{e}.
EQ 2.1

p. 20: Change (EQ 2.4) to v_{drift} =
m V/l

p. 21: Change (EQ 2.5) to I = qmn_{i}
(A/l)V

p22: Change (EQ 2.6) to 1/R = m
qn_{i} (A/l)

Change (EQ 2.7) to r = 1/ (m
qn_{i})