Geodesic
Investigations in homotopy theory of continuous mappings. I.~The algebraic theory of systems. II.~The natural system and homotopy type
Informatics and Automation, Investigations in homotopy theory of continuous mappings. I. The algebraic theory of systems. II. The natural system and homotopy type, Tome 46 (1955), pp. 3-158.

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@article{TRSPY_1955_46_a0,
     author = {M. M. Postnikov},
     title = {Investigations in homotopy theory of continuous mappings. {I.~The} algebraic theory of systems. {II.~The} natural system and homotopy type},
     journal = {Informatics and Automation},
     pages = {3--158},
     publisher = {mathdoc},
     volume = {46},
     year = {1955},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1955_46_a0/}
}
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M. M. Postnikov. Investigations in homotopy theory of continuous mappings. I.~The algebraic theory of systems. II.~The natural system and homotopy type. Informatics and Automation, Investigations in homotopy theory of continuous mappings. I. The algebraic theory of systems. II. The natural system and homotopy type, Tome 46 (1955), pp. 3-158. http://geodesic.mathdoc.fr/item/TRSPY_1955_46_a0/