I N Trubachev

Direct utilization of human liquid wastes by plants in a closed ecosystem.

J I Gitelson, G M Lisovsky, I V Gribovskaya, 1997, Advances in space research : the official journal of the Committee on Space Research.

Long-term experiments on man's stay in biological life-support system.

B. G. Kovrov, I A Terskov, B G Kovrov, 1989, Advances in space research : the official journal of the Committee on Space Research.