@article{MS2_1989__65_2_167081,
     author = {Veikko T. Purmonen},
     title = {Parbolic pseudo-differential initial-boundary value problems.},
     journal = {Mathematica Scandinavica},
     pages = {221--244},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1989},
     zbl = {0693.35170},
     url = {http://geodesic.mathdoc.fr/item/MS2_1989__65_2_167081/}
}