You may also wish to search for items by Jackel, G. and Jackel.
Only one matching reference was found.
Jackel, G.S.; Gordy, W., Electron Spin Resonance of Free Radicals Formed from Group-IV and Group-V Hydrides in Inert Matrices at Low Temperature, Phys. Rev., 1968, 176, 2, 443, https://doi.org/10.1103/PhysRev.176.443 . [all data]