@article{ZNSL_2021_508_a6,
     author = {S. I. Repin},
     title = {Error identities for parabolic initial boundary value problems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {147--172},
     publisher = {mathdoc},
     volume = {508},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2021_508_a6/}
}