@article{ZNSL_2006_337_a9,
     author = {V. G. Zhuravlev},
     title = {Sums of squares over the {Fibonacci} $\circ$-ring},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {165--190},
     publisher = {mathdoc},
     volume = {337},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2006_337_a9/}
}