Zelinka, B. Hasse’s operator and directes graphs. (English) Zbl 0175.21003 Čas. Pěst. Mat. 92, 313-317 (1967). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:topology × Cite Format Result Cite Review PDF Full Text: DOI EuDML