On the distribution of limit cycles in a Lienard system with a nilpotent center and a nilpotent saddle

On the distribution of limit cycles in a Lienard system with a nilpotent center and a nilpotent saddle
در مورد توزيع سيكل هاي حدي در يك سيستم ليينارد با يك مركز پوچتوان و يك زين پوچتوان

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https://people.iut.ac.ir/en/asheghi/content/1617774