Topological methods in nonlinear analysis.    Toruń :  Juliusz Schauder Center
http://sfx.knihovny.cz/sfxlcl3??url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/sfxit.com:opac_856&url_ctx_fmt=info:ofi/fmt:kev:mtx:ctx&sfx.ignore_date_threshold=1&rft.object_id=110978984081709&svc_val_fmt=info:ofi/fmt:kev:mtx:sch_svc&