diff --git a/R/blowflies.R b/R/blowflies.R
index 59a16503..e9878708 100644
--- a/R/blowflies.R
+++ b/R/blowflies.R
@@ -45,7 +45,7 @@
 ##'
 ##' \Wood2010
 ##'
-##' \Gurney1980
+##' \Gurney1980a
 ##'
 ##' \Brillinger1980
 ##'
diff --git a/R/bsmc2.R b/R/bsmc2.R
index 031868d1..cf4372ba 100644
--- a/R/bsmc2.R
+++ b/R/bsmc2.R
@@ -43,11 +43,8 @@
 ##' @author Michael Lavine, Matthew Ferrari, Aaron A. King, Edward L. Ionides
 ##'
 ##' @references
-##' Liu, J. and M. West.
-##' Combining Parameter and State Estimation in Simulation-Based Filtering.
-##' In A. Doucet, N. de Freitas, and N. J. Gordon, editors,
-##' Sequential Monte Carlo Methods in Practice, pages 197-224.
-##' Springer, New York, 2001.
+##'
+##' \Liu2001b
 NULL
 
 ## In annotation, L&W AGM == Liu & West "A General Algorithm"
diff --git a/man/blowflies.Rd b/man/blowflies.Rd
index 65e4a139..38f10eac 100644
--- a/man/blowflies.Rd
+++ b/man/blowflies.Rd
@@ -82,7 +82,7 @@ plot(blowflies2())
 
 \Wood2010
 
-\Gurney1980
+\Gurney1980a
 
 \Brillinger1980
 }
diff --git a/man/bsmc2.Rd b/man/bsmc2.Rd
index 006ea105..bb92d308 100644
--- a/man/bsmc2.Rd
+++ b/man/bsmc2.Rd
@@ -110,11 +110,7 @@ To circumvent this problem, use the \code{\link[=pomp]{cdir}} and \code{\link[=p
 }
 
 \references{
-Liu, J. and M. West.
-Combining Parameter and State Estimation in Simulation-Based Filtering.
-In A. Doucet, N. de Freitas, and N. J. Gordon, editors,
-Sequential Monte Carlo Methods in Practice, pages 197-224.
-Springer, New York, 2001.
+\Liu2001b
 }
 \seealso{
 More on Bayesian methods:
diff --git a/man/macros/citations.Rd b/man/macros/citations.Rd
index e88dc281..2ddab91f 100644
--- a/man/macros/citations.Rd
+++ b/man/macros/citations.Rd
@@ -24,10 +24,14 @@
 
 \newcommand{\Evensen2009}{G. Evensen. \emph{Data assimilation: the ensemble Kalman filter}. Springer-Verlag, 2009.}
 
-\newcommand{\Gurney1980}{W.S.C. Gurney, S.P. Blythe, and R.M. Nisbet. Nicholson's blowflies revisited. \emph{Nature} \bold{287}, 17--21, 1980.}
+\newcommand{\Gurney1980a}{W.S.C. Gurney, S.P. Blythe, and R.M. Nisbet. Nicholson's blowflies revisited. \emph{Nature} \bold{287}, 17--21, 1980.}
+
+\newcommand{\Harrell1982}{F. E. Harrell and C. E. Davis. A new distribution-free quantile estimator. \emph{Biometrika} \bold{69}, 635--640, 1982.}
 
 \newcommand{\He2010}{D. He, E.L. Ionides, and A.A. King. Plug-and-play inference for disease dynamics: measles in large and small populations as a case study.  \emph{Journal of the Royal Society Interface} \bold{7}, 271--283, 2010.}
 
+\newcommand{\Hyndman1996}{R. J. Hyndman and Y. Fan. Sample quantiles in statistical packages. \emph{American Statistician} \bold{50}, 361--365, 1996.}
+
 \newcommand{\Ionides2011}{E.L. Ionides. Discussion of \dQuote{Feature matching in time series modeling} by Y. Xia and H. Tong. \emph{Statistical Science} \bold{26}, 49--52, 2011.}
 
 \newcommand{\Ionides2015}{E.L. Ionides, D. Nguyen, Y. Atchadé, S. Stoev, and A.A. King. Inference for dynamic and latent variable models via iterated, perturbed Bayes maps. \emph{Proceedings of the National Academy of Sciences} \bold{112}, 719--724, 2015.}
@@ -48,7 +52,7 @@
 
 \newcommand{\Kucherenko2005}{S. Kucherenko and Y. Sytsko. Application of deterministic low-discrepancy sequences in global optimization. \emph{Computational Optimization and Applications} \bold{30}, 297--318, 2005. \doi{10.1007/s10589-005-4615-1}.}
 
-\newcommand{\Liu2001}{J. Liu and M. West. Combining Parameter and State Estimation in Simulation-Based Filtering. In A. Doucet, N. de Freitas, and N. J. Gordon, (eds.), \emph{Sequential Monte Carlo Methods in Practice}, pp. 197--224. Springer, New York, 2001.}
+\newcommand{\Liu2001b}{J. Liu and M. West. Combining parameter and state estimation in simulation-based filtering. In A. Doucet, N. de Freitas, and N. J. Gordon, (eds.), \emph{Sequential Monte Carlo Methods in Practice}, pp. 197--224. Springer, New York, 2001.}
 
 \newcommand{\London1973}{W. P. London and J. A. Yorke, Recurrent outbreaks of measles, chickenpox and mumps: I. Seasonal variation in contact rates. \emph{American Journal of Epidemiology} \bold{98}, 453--468, 1973.}
 
@@ -75,7 +79,3 @@
 \newcommand{\Wood2010}{S. N. Wood Statistical inference for noisy nonlinear ecological dynamic systems. \emph{Nature} \bold{466}, 1102--1104, 2010.}
 
 \newcommand{\Xia2011}{Y. Xia and H. Tong. Feature matching in time series modeling. \emph{Statistical Science} \bold{26}, 21--46, 2011.}
-
-\newcommand{\Hyndman1996}{R. J. Hyndman and Y. Fan. Sample quantiles in statistical packages. \emph{American Statistician} \bold{50}, 361--365, 1996.}
-
-\newcommand{\Harrell1982}{F. E. Harrell and C. E. Davis. A new distribution-free quantile estimator. \emph{Biometrika} \bold{69}, 635--640, 1982.}