1 Erratum to: Electr Eng DOI 10.1007/BF01574840

Typesetting errors in some formulas were discovered. The correct versions are listed below:

$$\begin{aligned} k_d =-\frac{2 \alpha \sin ^{2}\frac{\alpha \pi }{2}}{\gamma -1}+\frac{\sin ^{2}\frac{\alpha \pi }{2}+\left( {\gamma -1}\right) }{\gamma -1}c_\alpha ; \end{aligned}$$
(6)
$$\begin{aligned} c_{1d} =\int \limits _0^{y_1 } {\frac{\hbox {d}y}{\delta _y}}. \end{aligned}$$
(37b)
$$\begin{aligned} K_d =\frac{1}{2 \sin ^{2}\frac{\alpha _c }{2}}\left[ {2+\frac{n_c}{4}\cdot \frac{b_D }{S_d }} \right] \frac{\alpha _c}{\pi }, \end{aligned}$$
(52)