TY  - RPRT
TI  - Unary and binary multisystems: Topologic classification of phase diagrams and relation to Euler's theorem on polyhedra
AU  - E. H. Roseboom
AU  - E-An Zen
PY  - 1982
DO  - 10.2475/ajs.282.3.286
UR  - https://pubs.usgs.gov/publication/70011804
ID  - 70011804
ER  -