On the basis of experimental and production data of observations of zenith distances in triangulation networks of classes III-IV, the accuracy of geodetic leveling was investigated.
1. Dzhuman B. M. Raschet tochnosti izmerenija zenitnyh rasstojanij v periody spokojnyh izobrazhenij. — «Geodezija, kartografija i ajerofotos#emka», 1974, vyp. 20