Smythe, William R. Static and Dynamic Electricity - 2a. ed. - McGraw-Hill, 1950. - xxi, 616 p. : gráfs. ; 24 cm. - International ser. in pure and applied physics . Apéndice, pp. 585-591 Bibliografía al final de capítulos Subjects--Topical Terms: ELECTROSTATICA Universal Decimal Class. No.: 537.2