B Gelberg and G Pekelis were mechanical engineering academicians. They authored Repair of Industrial Equipment which was first published in 1968 in Russian as Reparación De Máquinas Herramienta. It was translated into Italian and English by B. Nikolaevin soon after. The earliest available English edition is from 1978. The two have also co-authored a book on Repair of Metal Cutting Machines and Demolition of Industrial Equipment.