Olum, P. (1961). Invariants for effective homotopy classification and extension of mappings. American Mathematical Society.
Chicago Style (17th ed.) CitationOlum, Paul. Invariants for Effective Homotopy Classification and Extension of Mappings. Providence, R.I.: American Mathematical Society, 1961.
MLA (9th ed.) CitationOlum, Paul. Invariants for Effective Homotopy Classification and Extension of Mappings. American Mathematical Society, 1961.
Warning: These citations may not always be 100% accurate.