Higher order Motional Resonances Spectra of electrons with Non-linear Axial Oscillations in Quadrupole Penning trap. J. Nig. Soc. Phys. Sci. [Internet]. 2022 Feb. 27 [cited 2024 May 4];4(1):75-82. Available from: https://www.journal.nsps.org.ng/index.php/jnsps/article/view/371