[801] The (φ,$k$) rectifiable subsets of a homogeneous space

[802] On non-linear differential equations of the second order: IV. The general equation $$\ddot y + kf\left( y \right)\dot y + g\left( y \right) = bkp\left( \varphi \right)$$ , φ=$t$+α, φ=$t$+α

[803] Another proof of the existence of special divisors

[804] The valuation theory of meromorphic function fields over open Riemann surfaces

[805] The homology groups of some ordered systems