[1]
Ramm, A.G. 2017. Completeness of the set \(\{e^{ik\beta \cdot s}\}|_{\forall \beta \in S^2}\).
Global Journal of Mathematical Analysis
. 5, 2 (Jul. 2017), 43–43
. DOI:https://doi.org/10.14419/gjma.v5i2.7975
.