H. Jönsson, M. Heisler, G.V. Reddy, V. Agrawal, V. Gor,
B.E. Shapiro, E. Mjolsness and E.M. Meyerowitz Modeling the organization of the WUSCHEL expression domain in the
shoot apical meristem Bioinformatics21(Suppl. 1), i232-i240 (2005)
The fourth term in equation 7 (-dY) should read -dYA.