Reference
Bénédicte Alziary Chassat, Jacqueline Fleckinger, Marie-Hélène Lécureux, and Na Wei, “Positivity and negativity of solutions to nxn weighted systems involving the Laplace operator defined on Rn, n>=3”, Electronic Journal of Differential Equations, vol. 101, 2012, pp. 1–14.
See also
Published in
Electronic Journal of Differential Equations, vol. 101, 2012, pp. 1–14