@article{10_1007_s10492_016_0126_x,
     author = {Lu, Zuliang},
     title = {New a posteriori $L^{\infty }(L^2) $ and $L^2(L^2)$-error estimates of mixed finite element methods for general nonlinear parabolic optimal control problems},
     journal = {Applications of Mathematics},
     pages = {135--163},
     publisher = {mathdoc},
     volume = {61},
     number = {2},
     year = {2016},
     doi = {10.1007/s10492-016-0126-x},
     mrnumber = {3470771},
     zbl = {06562151},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-016-0126-x/}
}