J. Hagmann

Emil Stöhrer and the development of electrical motor technology in the 1840s

F. Dittmann, J. Hagmann, J. Hagmann, 2012, 2012 Third IEEE HISTory of ELectro-technology CONference (HISTELCON).

Facilitating competence development to put learning process approaches into practice in rural extension.

J. Hagmann, E. Moyo, 2000 .