A partial answer is given to a problem of Ulas (2011), asking when the nth Stern polynomial is reciprocal.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ba63-2-4, author = {A. Schinzel}, title = {Reciprocal Stern Polynomials}, journal = {Bulletin of the Polish Academy of Sciences. Mathematics}, volume = {63}, year = {2015}, pages = {141-147}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba63-2-4} }
A. Schinzel. Reciprocal Stern Polynomials. Bulletin of the Polish Academy of Sciences. Mathematics, Tome 63 (2015) pp. 141-147. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba63-2-4/