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- [4] Do open-access articles have a greater research impact? COLLEGE & RESEARCH LIBRARIES, 2004, 65 (05): : 372 - 382
- [5] WHY DO WE HAVE TO PAY SO MUCH? BULLETIN OF THE NATIONAL TAX ASSOCIATION, 1943, 29 (01): : 16 - 17
- [6] Do I have to pay for a canceled Appointment? SCHWEIZER ARCHIV FUR TIERHEILKUNDE, 2018, 160 (05): : 258 - 258