@article{10_21136_MB_2018_0063_17,
     author = {Hemdaoui, Mohammed},
     title = {A useful algebra for functional calculus},
     journal = {Mathematica Bohemica},
     pages = {99--112},
     publisher = {mathdoc},
     volume = {144},
     number = {1},
     year = {2019},
     doi = {10.21136/MB.2018.0063-17},
     mrnumber = {3934200},
     zbl = {07088838},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2018.0063-17/}
}