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2018
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V. P. Zastavnyi, A. Manov, “Positive Definiteness of Complex Piecewise Linear Functions and Some of Its Applications”, Mat. Zametki, 103:4 (2018), 519–535; Math. Notes, 103:4 (2018), 550–564
V. P. Zastavnyi, A. D. Manov, “On the Positive Definiteness of Some Functions Related to the Schoenberg Problem”, Mat. Zametki, 102:3 (2017), 355–368; Math. Notes, 102:3 (2017), 325–337