Reference

I. G. Firsov (1956): Pollination of red clover in the Mari ASSR; [Ru; 5 tabs. Date: 27.II.1956]. – In: KRICUNAS, I. V. & A. F. GUBIN (eds.). Pollination of Agricultural Plants. [A Collection of Scientific Papers]. Moscow (State Publishing House of Agricultural Literature) – : 76 - 88.