High-resolution observations with ARTEMIS/JLS and the NRH - IV. Imaging spectroscopy of spike-like structures near the front of type-II burstsS. Armatas, C. Bouratzis, A. Hillaris, C. E. Alissandrakis, P. Preka-Papadema, A. Kontogeorgos, P. Tsitsipis and X. MoussasA&A, 659 (2022) A198DOI: https://doi.org/10.1051/0004-6361/202142406