@article{700173,
     title = {Periodic solutions of partial differential equations with hysteresis},
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {[221]-226},
     mrnumber = {MR0877128},
     zbl = {0614.35004},
     url = {http://dml.mathdoc.fr/item/700173}
}

Krejčí, Pavel. Periodic solutions of partial differential equations with hysteresis, dans Equadiff 6, GDML_Books,  (1986), pp. [221]-226. http://gdmltest.u-ga.fr/item/700173/