@article{10_4064_ap_52_2_195_204,
     author = {Ludwik Byszewski},
     title = {Strong maximum and minimum principles for parabolic functional-differential problems with nonlocal inequalities $[u^j(t_0, x) - K^ j] + \ensuremath{\Sigma}_i h_ i(x)[u^j(T_i, x)-K^j] \stack{\ensuremath{\leq}} {(\ensuremath{\geq})} 0$},
     journal = {Annales Polonici Mathematici},
     pages = {195--204},
     publisher = {mathdoc},
     volume = {52},
     number = {2},
     year = {1990},
     doi = {10.4064/ap-52-2-195-204},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-52-2-195-204/}
}