John, Fritz, 1910- Plane waves and spherical means applied to partial differential equations/ Fritz John. - New York: Interscience Publishers, [1955]. - viii, 172 p.: illus., 24 cm. - Interscience tracts in pure and applied mathematics; no. 2 . Bibliography: p. 165-170. LCCN: 56000268 /L Nat. Bib. No.: GB56-1778 Subjects--Topical Terms: Differential equations, Partial. Dewey Class. No.: 515.35 / J65p