@article{SJIM_2005_8_4_a10,
     author = {I. A. Firdman},
     title = {Algebraic classification of physical structures with {zero.~I}},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {131--148},
     publisher = {mathdoc},
     volume = {8},
     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2005_8_4_a10/}
}