@book{ Solr-vaari.894878, title = {Sähkö- ja magneettikentät}, author = {Voipio, Erkki}, address = {Espoo}, publisher = {Otakustantamo}, year = {1987}, edition = {2. [i.e. 4.] korj. p.}, note = {3. p. 1983}, note = {Otakustantamo ; 381.}, }