[6301] Extremal length and functional completion

[6302] Über die Integration Eines Tensorfeldes

[6303] The prediction theory of multivariate stochastic processes

[6304] On non-linear differential equations of the second order. III. The equation $$\ddot y - k\left( {1 - y^2 } \right)\dot y + y = b\mu k$$ cos (μt+α) for large k, and its generalizationscos (μt+α) for large k, and its generalizations

[6305] 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