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Weak and strong extensions of differential operators. (English) Zbl 0111.29202

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[1] Friedrichs, Trans. Amer. Math. Soc. 55 pp 132– (1944)
[2] Friedrichs, Comm. Pure Appl. Math. 6 pp 299– (1953)
[3] Hörmander, Math. Ann. 140 pp 124– (1960)
[4] Hörmander, Ark. Mat. 3 pp 501– (1958)
[5] Théorèmes de régularité pour quelques classes d’opérateurs différentiels, Thèse, Lund, 1959.
[6] Thèse d’Hörmander II, Séminaire Bourbaki 135, mai, 1956, 2nd Ed.
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