https://katalog.hgb-leipzig.de/Record/0-1179996321 Fechner, Gustav Theodor:
De magnetismo variabili ... — Lipsiae : Saur, (1839).
ISBN 3598507054, 3598500203, 3598500351, 3598500343, 3598501358, 3598500009, 3598533209, 3598533225, 3598533020, 3598533039, 3598533381, 359853339X, 3598533160, 3598533179, 3598533187, 3598533195, 9783598533037, 9783598533396, 9783598500206, 9783598501357, 9783598507052, 9783598533020, 9783598533204, 9783598533389, 9783598533167, 9783598533228, 9783598500343, 9783598500350, 9783598500008, 9783598533181, 9783598533198, 9783598533174