21. An introduction to spectral analysis /   Publication: London : Pion, 1971 . 174 p. : Date:1971 Availability: Copies available: Turkeyen Campus Science & Technology [QA403.5 R38] (1), Actions: Add to cart No cover image available No cover image available
22. Spatial processes /   Publication: London: Pion Limited, 1981 . 266p. Date:1981 Availability: No items available: Actions: Add to cart No cover image available No cover image available