Mezhdunarodna konferentsiia po koefitsienta na polezno deistvie na napoitelnite sistemi i meropriiatiia za podobriavaneto mu, 24-31 avgust 1959 g.Sofiia
Subtitle: [Doklady i suobshteniia
By: Red.kol.: Dino Velev, Emil Strakhilov, Zdravko Diankov]
Publisher: Izd.na Bulgarskata akad.na naukite
Published: 1960
Place of publication: Sofiia
Language: bul
Number of pages: 379
Notes: Russian, German and English summaries.