2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39936Results of analytical calculations for heavy quark systems in higher orders of perturbation theory are overviewed. I discuss baryons with one finite mass quark in the next-to-leading order and heavy quark pair production near the threshold within NRQCD.14 pages, latex, 1 figure. Talk given at Research Workshop ``Calculations for Modern and Future Colliders'', JINR, Dubna, Russia, July 9-23, 2000High Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext