Froman, N., & Froman, P. O. (2002). Physical problems solved by the phase integral method. CUP.
Chicago Edition CitationFroman, Nanny, and Per Olof Froman. Physical Problems Solved by the Phase Integral Method. UK: CUP, 2002.
MLA Edition CitationFroman, Nanny, and Per Olof Froman. Physical Problems Solved by the Phase Integral Method. CUP, 2002.
Warning: These citations may not always be 100% accurate.