Pengaruh jeda waktu, besaran biaya kegiatan promosi, sengketa hukum (kasus litigasi), waktu pelaksanaan listing dan pemberian waran terhadap tingkat initial return penawaran saham perdana = The effects of listing delays, promotion expenses, legal cases (litigation), the timing of listings and warrant issuances on the degree of the initial returns of equity IPOs / Patron Mohammad Hara