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Publications by Phillip Ronald Helm

Linear Groups: On Non-Congruence Subgroups and Presentations

Bulletin of the Australian Mathematical Society

English

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Hecke Operators for Non-Congruence Subgroups of Bianchi Groups

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A Note on Almost Subnormal Subgroups of Linear Groups

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Algebraic Groups and Co-Compact Subgroups of Complex Linear Groups

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Hopf Algebras and Congruence Subgroups

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Maximal Subgroups Containing Root Subgroups in Linear Groups Over Commutative Ring

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Subgroups of the Modular Group Defined by a Single Linear Congruence

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On a Question About Generalized Congruence Subgroups

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Inclusion Theorems for Congruence Subgroups

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Finite Groups With Nine Non-Subnormal Subgroups

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