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Citation: Cm. Raiteri et al., Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity, ASTRON ASTR, 377(2), 2001, pp. 396-412

Authors: Heisler, C

Citation: C. Heisler, Influence of tillage and crop rotation on biological activity, AGRIBIOL RE, 51(4), 1998, pp. 289-297

Authors: Heisler, C Rogasik, H Brunotte, J Joschko, M

Citation: C. Heisler et al., Conservation tillage and biological activity, LANDBAU VOL, 48(4), 1998, pp. 199-212