TY  - RPRT
TI  - [Basic stages for developoing hygiene and ecology].
AU  - P G Tkachev
AU  - A A Liapkalo
AU  - I P L'gova
AU  - V N Riabchikov
UR  - https://pubmed.ncbi.nlm.nih.gov/12861678/
ID  - 12861678
ER  -