text:   Systems of Rank 2",2,"['New Paper: I construct Levelt filtration for singularly perturbed linear systems of #ODE (in rank 2 at a regular singular point) maintaining very tight #asymptotic control by upper-triangularising such system in a singular #perturbation families.\n\n<LINK>', 'I put this paper out whilst attending the @NCCRSwissMAP General Meeting in Villars-sur-Ollon. Hit submit with the Alps in my view.']",19,09,384