1. Multivariate copulas with given values at two arbitrary pointsErich Peter Klement, Damjana Kokol-Bukovšek, Matjaž Omladič, Susanne Saminger, Nik Stopar, 2022, original scientific article Keywords: mathematics, mathematical analysis, mathematical methods, copula, quasi-copula, multivariate distribution, bounds
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2. Nil rings and prime ringsNik Stopar, 2013, doctoral dissertation Keywords: prime rings, zero product preservers, rings of quotients, extended centroid, involution, nil ring, upper nilradical, Jacobson radical, integral ring, ▫$\pi$▫-algebraic element, quasi-regular element, Köthe conjecture
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3. On the exact regions determined by Kendall's tau and other concordance measuresDamjana Kokol-Bukovšek, Nik Stopar, 2023, original scientific article Keywords: matematics, mathematical statistics, linear algebra, copula, dependence, concordance measure, Kendall’s tau, Spearman’s footrule, Gini’s gamma
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4. On the exact region determined by Spearman's rho and Spearman's footruleDamjana Kokol-Bukovšek, Nik Stopar, 2024, original scientific article Keywords: copula, dependence concepts, supremum and infimum of a set of copulas, measures of concordance, quasi-copula, local bounds, Spearman’s rho, Spearman’s footrule
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5. Quasi-copulas as linear combinations of copulasGregor Dolinar, Bojan Kuzma, Nik Stopar, 2024, original scientific article Keywords: quasi-copulas, copulas, linear combination, affine combination, Minkowski norm
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6. Analysis of ion orbits in front of a negative planar electrode immersed in an oblique magnetic fieldTomaž Gyergyek, Nik Stopar, Stefan Costea, Jernej Kovačič, 2022, original scientific article Keywords: plasma, divertor, fusion, Larmor radius, magnetic field
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7. Exact upper bound for copulas with a given diagonal sectionDamjana Kokol-Bukovšek, Blaž Mojškerc, Nik Stopar, 2024, original scientific article Keywords: mathematical statistics, mathematical analysis, mathematical methods, copula, diagonal section, exact upper bound, asymmetry
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9. Coherence and avoidance of sure loss for standardized functions and semicopulasErich Peter Klement, Damjana Kokol-Bukovšek, Blaž Mojškerc, Matjaž Omladič, Susanne Saminger, Nik Stopar, 2024, original scientific article Keywords: copulas, quasi-copulas, semicopulas, standardized function, coherence, avoidance of sure loss, k-increasing function
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