By Ptashnyk B.   Tymkiv I.   in Ukrainian Mathematical Journal

ISSN:0041-5995|65|3|463-477

Springer Publishing Company ‎(2013)‎

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By Il’kiv V.   Ptashnyk B.   in Ukrainian Mathematical Journal

ISSN:0041-5995|58|12|1847-1875

Springer Publishing Company ‎(2006)‎

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By Il’kiv V.   Ptashnyk B.   in Siberian Mathematical Journal

ISSN:0037-4466|46|1|94-102

Springer Publishing Company ‎(2005)‎

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By Ptashnyk B. I.   Symotyuk M. M.   in Ukrainian Mathematical Journal

ISSN:0041-5995|55|2|293-310

Springer Publishing Company ‎(2003)‎

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By Samoilenko A.M.   Ptashnyk B.I.   in Ukrainian Mathematical Journal

ISSN:0041-5995|54|4|709-710

Springer Publishing Company ‎(2002)‎

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By Ptashnyk B.I.   Symotyuk M.M.   in Ukrainian Mathematical Journal

ISSN:0041-5995|55|3|481-497

Springer Publishing Company ‎(2003)‎

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By Bilusyak N.I.   Ptashnyk B.I.   in Ukrainian Mathematical Journal

ISSN:0041-5995|53|9|1546-1553

Springer Publishing Company ‎(2001)‎

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By Bilusyak N.I.   Ptashnyk B.I.   in Ukrainian Mathematical Journal

ISSN:0041-5995|53|2|276-282

Springer Publishing Company ‎(2001)‎

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