Sentence:  Therefore , the only conceivable alternatives are those represented , on the one hand , by the two at least apparently self-consistent but mutually exclusive positions of Buri and Barth and , on the other hand , by the third but really pseudo position ( analogous to a round <WSD>square</WSD> ) of Bultmann . 
Meaning of the word marked with <WSD> tags:  (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon