@article{Khmelnitskii_2014, title={Cockcroft–Swan Theorem for Projective Crossed Chain Complexes}, volume={66}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/2255}, abstractNote={The Cockcroft–Swan theorem is proved for $n$-dimensional projective crossed chain complexes $(Pi,G, ∂_i)$, where $G = A * F$ is a free product of a fixed group $A$ by a free finitely generated group $F$.}, number={12}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Khmelnitskii, N. A.}, year={2014}, month={Dec.}, pages={1694-1704} }