Promenlivoto rabotno vreme
By: Iv. Nikolaev, S. Todorova, T. Miloshova.
Contributors: Todorova, Sasha, joint author.; Miloshova, T., joint author.
Publisher: Nauchnoizsl. in-t po truda
Published: 1979
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 172
Subjects: Time study.
Notes: Includes bibliographical references.
Summary in German and Russian.