Wielandt, Erhard Chapters, New Manual of Seismological Observatory Practice (NMSOP), Deutsches GeoForschungsZentrum;
http://gfzpublic.gfz-potsdam.de/pubman/item/escidoc:56076 (Publisher version)
Chapter_5_rev1.pdf (Publisher version), 744KB
Wielandt, E. (2009 online): Seismic Sensors and their Calibration. - In: Bormann, P. (Ed.), New Manual of Seismological Observatory Practice (NMSOP), Potsdam : Deutsches GeoForschungsZentrum GFZ, 1-46.https://doi.org/10.2312/GFZ.NMSOP_r1_ch5