Muranov, Y. V., and R. Jiménez. “Splitting Obstruction Groups Along One-Sided Submanifolds”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 66, no. 3, Mar. 2014, pp. 316–332, http://umj.imath.kiev.ua/index.php/umj/article/view/2135.