$\mathbf{\bar{C}_{n,n-1}}$ revisited
${\bf C}^*$-extensions of tori, higher Chow groups and applications to incidence equivalence relations for algebraic cycles.
${\bf C}_+$-actions on contractible threefolds
${\cal H}$-cohomologies versus algebraic cycles
${\mathbb G}_a^M$ degeneration of flag varieties
${\rm K}_1(\mS_1)$ and the group of automorphisms of the algebra $\mS_2$ of one-sided inverses of a polynomial algebra in two variables
$β$-nbc bases for cohomology of local systems on hyperplane complements
$ε$-factors for Gauss-Manin determinants
$ε$-Factors for the Period Determinants of Curves
$Λ$-modules and holomorphic Lie algebroid connections
$π_1$-classification of real arrangements with up to eight lines