coalescing

sulautuma- (present participle of)
coalescence
{{quote-journal|year=2015|date=|author=Zafar Ahmed, Joseph Amal Nathan, Dhruv Sharma, Dona Ghosh|title=Real discrete spectrum of complex PT-symmetric scattering potentials|journal=arXiv|url=http://arxiv.org/abs/1510.06226|doi=|volume=|issue=|pages=