Including grazing
(Wroblewski et al., 1975; Denman and Platt, 1975)
P
t
=
k
P
xx
+
m
P -
R[1-exp(-
l
P)]
- R
l
P
L
c
=
p
Ö
[
k
/(
m
-R
l
)]
But this is only for small times…
